Test EIZO CG2700X: Graphics professionalwith UHD resolution
27" 4K graphics monitor offers excellent surface homogeneity and a very
high colour gamut for the most demanding image retouching and coloursafe proof simulations

Introduction
We already had the opportunity to convince ourselves of the qualities of the EIZOCG2700S in the summer of last year. The CG2700X was announced at that time,
but not yet available on the German market. Just in time for the market launch,
we can now put the latest model of the ColorEdge series through its paces. The
bar is set high. We are curious to see how the CG2700X compares to its little
brother.
Both models have a 27-inch IPS panel, but the resolution of the CG2700X is muchfiner. 3840 x 2160 pixels not only promise plenty of space on the desktop, but also
optimal text and graphics display. Furthermore, the contrast range and stability
are significantly improved compared to the majority of IPS variants currently
available. EIZO calls this True Black technology. Also pleasing: the comparatively
high maximum luminance. This does not yet qualify the CG2700X for colour
correction and retouching of HDR material in a professional environment. However,
all other users will appreciate the extensive HDR tone curves that are integrated
into the hardware calibration.
As usual, the scaler pipeline contains a programmable 3D LUT with 16 bits. It canbe further optimised for the specific application via ColorNavigator. The hardware
calibration software developed by EIZO has always been a guarantee for extremely
precise colour reproduction. Due to the measuring device built into the monitor,
there is no need for a separate probe.
However, for use in colour-critical environments, high-performance signal
processing is only a necessary, but not sufficient, prerequisite. At least as
important is the highest possible colour gamut. The CG2700X should cover Adobe
RGB and DCI-P3 RGB almost completely. This means that all common offset
printing conditions can be reliably reproduced. The proven "Digital Uniformity
Equalizer", an equalisation function to improve area homogeneity, is also on board
again.
Via USB-C, a connected notebook can transmit video signals to the monitor andbe supplied with data from keyboard and mouse as well as power and network. A
second USB interface enables KVM functionality. Only one set of input devices isrequired for two connected systems.
For detailed information on the features and specifications, please refer to the EIZOCG2700X data sheet.

Scope of delivery
EIZO ships the CG2700X with an HDMI cable, two USB cables (type C and type A
to type B) and a power cable. We miss a DisplayPort cable, which is still often used
today. Disturbing light influences are reduced via a light shield.
In addition, a report proves the factory calibration. The complete user manual andthe ColorNavigator software for hardware calibration can be downloaded from the
EIZO homepage.

Optics and mechanics
Externally, the CG2700X and CG2700S are completely similar. This is not unusual
for EIZO. Even in the past, the design was only adapted cautiously at best. Our
test device presents itself accordingly simple and unagitated. Nevertheless, theattribute "boring" does not do it justice. The no-frills casing made of dark plastic
fits well into any work environment. A clear frame surrounds the panel. It thickens
in the upper middle area to form a bulge that contains the integrated measuring
device. It folds out after activation. However, we miss a flap for dust protection.

The built-in measuring device in the retracted state
The back also presents itself in a tidy manner. Defining design elements are the
EIZO logo and a fine metal grid that covers large areas and ensures good heatdissipation.

The EIZO CG2700X with light protection screen
The frame width is about 1.9 cm. In the upper area we measure 3.1 cm. On thedesk, the EIZO CG2700X takes up just under 24 cm. Without the stand, there is
still about 8 cm.

Stand leg and USB inputs
Material appearance and build quality are good, but not significantly above theclass average. The gaps remain small all around.

Lowest position from the front
Lowest position from behindHighest position from the front
Highest position from behind

The height adjustment range is 15.5 cm. In the lowest setting, the distance fromthe lower edge of the frame to the table surface is 3.5 cm. In the highest position,
we measure 19 cm. The maximum backward tilt is 35 degrees. A tilt in the opposite
direction is possible up to about 5 degrees. Alternative mounting systems areconnected to the monitor via the VESA 100 screw connection.

Maximum angle of inclination to the rear
Maximum forward tilt angle
The stand allows 180 degree rotation in both directions.

Lateral rotation to the right
Lateral rotation to the left
The EIZO CG2700X can also be operated in portrait orientation via a swivel joint.

Upright alignment (pivot) from the front
Upright alignment (pivot) from behind
The waste heat generated during operation is dissipated via the housing with theextended perforated plate and a few additional ventilation slots. Brightness- orcontrast-dependent noise is completely absent.

Rear of the EIZO CG2700X with the perforated plate
The light protection screen leaves an ambivalent impression. It comes in one
piece and can be mounted in a flash thanks to integrated magnets. Many
competing products are much more complicated to handle.
However, the quality of workmanship and feel are mediocre. Moreover, there is
no option to use the diaphragm in portrait mode.

Power consumption
With a luminance of 140 cd/m², we determine an efficiency of only 0.8 cd/W.
This makes the EIZO CG2700X no efficiency miracle. Resolution and colour
gamut take their toll here. In addition, the white level is reduced due to the area
homogeneity enhancement. With the "Brightness" setting, the power
consumption is slightly reduced accordingly.
In energy-saving mode, the power consumption drops sufficiently. Thanks to areal power switch, it can finally be reduced to zero.

Manufacturer

MeasuredOperation maximum

225 W

62 W

Operation typical

34 W

-

140 cd/m² (DUE: On)

k. A.

33,4 W

140 cd/m² (DUE: Brightness)

k. A.

35,6 W

Operation minimum

k. A.

27 W

Stand-by mode

0,5 W

0,5 W

Switched off (mains switch)

0W

0W

Connections
The EIZO CG2700X accepts video signals via three connections. The user has a
DisplayPort, HDMI and USB-C input with DisplayPort implementation at theirdisposal. A feed in 10 bits per colour channel is possible for each input in RGB andYCbCr without colour subsampling.

The signal inputs of the EIZO CG2700X
The integrated USB hub provides four downstream sockets according to version
3.1 (2 x) and 2.0 (2 x). The interfaces are recessed on the side, while theconnection to the computer is made via the rear port array. Here you will find a
USB-C interface and a USB-B upstream port. They can be assigned to one of thethree signal inputs via the OSD. Switching then takes place automatically. A simple
but functional KVM switch.
However, the possible uses of the USB-C interface go far beyond those of a KVM
switch. Data from the Ethernet home network is also available here, which reaches
the monitor via the RJ-45 socket, which is also present. Connected devices canalso be supplied with power up to 94 watts. The EIZO CG2700X thus replaces a
USB-C dock. A welcome development that is finding its way into more and moremonitors.

Operation
The controls, which are almost completely unlabelled, have been recessed in thelower frame. To facilitate navigation, their current function assignment isdisplayed. With the exception of the power switch, these are touch-sensitive
buttons. Due to the design, there is no haptic feedback. Various actions - includingchanging the signal input and picture mode - can be carried out directly.

OSD
Despite the comprehensive hardware calibration, EIZO does not do without a very
comprehensive OSD. It is divided into seven clearly structured main menu items.
The intensity of the backlight is changed via a brightness control. The desired white
point can be adjusted via presets in Kelvin, three RGB gain controls or normative
specifications.
A change of the tone value curve is possible via the gamma controller. Apart fromfixed values (1.6 to 2.7), the sRGB characteristic, among others, can also be
selected directly. In addition, PQ and HLG gamma curves are available. The
gradation characteristic can be adjusted here via further parameters. The colour
space emulation is also extensive. In addition to sRGB and Adobe RGB, DCI-P3
RGB and ITU-R BT. 2020 are available. An optional gamut clipping ensures theprecise reproduction of in-gamut colours and is particularly interesting for the large
colour gamut defined in ITU-R BT. 2020 defined colour gamut. The colour spaceemulation can be controlled individually via ColorNavigator.

Three scaling settings allow for page-filling, area-filling and unscaled display of
incoming signals. Their dynamic range is also taken into account. Under certain
conditions (see section "Interpolation"), even simple pixel repetition can be used.
The self-calibration is configured via a separate menu item. The necessary target
parameters are determined from a previous calibration with ColorNavigator.
However, the settings, for example exact scheduling, can also be completely
managed by the user in the software.
Other functions include selecting the menu language and positioning the OSD.

Menu: Signal
Menu: Colour

Menu: Colour -> Advanced
Menu: SelfCalibration

Menu: Screen
Menu: Preferences

Picture quality and signal processing
GeneralEIZO uses a 27-inch IPS panel with LED backlighting for the CG2700X. No further
information can be found in the data sheet. So-called quantum dots could be used
to optimise its emission spectrum, i.e. to convert or filter it into the desired,relatively narrow-band range. Compared to the EIZO CG2700S, there are hardly
any differences.

Spectral radiation distribution white (colour location ~D65) according to colour
filters (i1Pro 2; optical bandpass: 10 nm)
In fact, together with the excellent LC panel, the scaler developed in EIZO'slaboratories and cast in an ASIC ensures extremely precise colour reproduction.
The programmable 3D LUT is particularly emphasised in the advertising and data
sheet, but is ultimately only one component of the extensive signal processing
chain. Our expectations are correspondingly high. Nevertheless, the EIZOCG2700X is able to meet them. Its display is always in harmony with the settings
made. Visually and metrologically (see the following sections) there are nocomplaints - even before the hardware calibration via ColorNavigator.

Test image to check grey gradients
In addition to a neutral and homogeneous display, the EIZO CG2700X scores withthe very good viewing angle stability of its IPS panel and a comparatively highcontrast range. Furthermore, the contrast loss that is otherwise common for IPS
technology, which can lead to annoying brightening even when viewed from thefront, has been greatly reduced.

Coating
The surface coating of the panel has a great influence on the visual assessment ofimage sharpness, contrast and sensitivity to ambient light. We examine the coatingwith the microscope and show the surface of the panel (foremost film) in extreme
magnification.

Coating of the EIZO CG2700X
Coating reference image
A microscopic view of the subpixels, focusing on the screen surface: The EIZOCG2700X has a dull matt surface with microscopically visible depressions for
diffusion. Grain or glitter effects are completely absent.

Interpolation
Our test signals are processed well. Scaling by the graphics card does not improvethe display. EIZO does without a separate sharpness control, but in mostimplementations this only achieves questionable improvements anyway.
Content with a square pixel aspect ratio can be displayed without distortion.
However, the same applies to SD video signals that deviate from this.

Scaling options
The following pictures give a rough impression of the quality of the scaling. The
distance of the camera to the screen is always identical and it is always scaled tofull screen according to the page.

Resolution 3840 x 2160 (native)
Resolution 1920 x 1080

Resolution 1024 x 768

Resolution 3840 x 2160 (native)
Resolution 1920 x 1080

Resolution 1024 x 768
The "Nearest Neighbor" setting scales the signal by means of simple pixel
repetition. The option only applies to input resolutions that can be mapped to thefull panel resolution with an integer factor. This includes a typical Full HD signal
with its 1920 x 1080 pixels. The result is shown below.

Resolution 1920 x 1080 - "Nearest Neighbor" (pixel repetition)

Resolution 1920 x 1080 - "Nearest Neighbor" (pixel repetition)
Juddertest
To test the frequencies and playback characteristics supported by the EIZOCG2700X, we fed in various signals and evaluated the result.

Juddertest on the EIZO CG2700X
Our test signals ranging from 24 to 75 Hz are supported throughout. The display
is judder-free with all refresh rates (24 Hz, 50 Hz, 60 Hz) that are particularly
important for video playback.
Deinterlacing
Since an LC display is always full-frame (progressive), a built-in deinterlacer must
create a full-frame sequence from incoming fields (interlaced).
We check the deinterlacing with field sequences in 3:2 and 2:2 rhythm and thenplay in real video material with non-contiguous fields. Optimally, the deinterlacer
can reconstruct the original full-frame sequence without loss in the first two cases.

The EIZO CG2700X does not recognise the original full images. Resolution losses
are the result. However, the deinterlacing works quite well overall. Comb
artefacts are absent even with poor material with little in-picture movement.

No recognition of 3:2 signals
No recognition of 2:2 signals

Test of the video mode deinterlacing
Signal level and colour model
The EIZO CG2700X processes digital RGB and YCbCr signals. The dynamic range
can be adjusted via the "Input Range" setting. "Limited" assumes a common video
signal without btb and wtw components (tonal value range with 8-bit precision:
16-235). "Limited (109 % White)", on the other hand, preserves possible
information in the highlights (tonal range at 8-bit precision: 16-254). "Full" is thecorrect selection for signals that use the full dynamic range (tonal range at 8 bit
precision: 0-255).

Dynamic range adjustment

Illumination
The illumination of our test device is very good. Even at the edges, there are hardly
any irregularities. Even shots with extremely long exposure times reveal only a
few artefacts.

Illumination of the monitor with short exposure time
Illumination of the monitor with long exposure time

Image homogeneity
We examine the image homogeneity on the basis of four test images (white,neutral tones with 75 %, 50 %, 25 % brightness), which we measure at 15 points.
This results in the averaged brightness deviation in % and the likewise averaged
delta C (i.e. the chromaticity difference) in relation to the respective centrally
measured value.

Brightness distribution [%] (DUE: Uniformity)
Colour Uniformity [Delta C] (DUE: Uniformity)
The implementation of the DUE ("Digital Uniformity Equalizer") has always been
one of the pronounced strengths of the ColorEdge series. This does not changewith the EIZO CG2700X. The display is extremely uniform across the entire panel
surface and all mid-tones. Brightness and colour deviations are neither visible tothe naked eye nor can they be detected by measurement.
Via the Administrator menu protected with a special key combination (shown inthe manual) or ColorNavigator, the interventions of the equalisation function canbe reduced (DUE Priority: Brightness). This increases the contrast range.

Brightness distribution [%] (DUE: Brightness)
Colour Purity [Delta C] (DUE: Brightness)
The colour drift is still very low. However, the brightness distribution deteriorates
significantly. Starting from a previously almost perfect result, a good rating isnevertheless only just missed.
At this point we would like to point out that the position of our measurements are
shifted towards the edges compared to the requirements in ISO 12646.
Brightness, black level, contrast
Measurements are taken after calibration to D65 as the white point. If possible,
all dynamic controls (including local dimming) are deactivated. Due to thenecessary adjustments, the results are lower than when performing the test
series with native white point.
The measurement window is not surrounded by a black border. The values cantherefore be compared more with ANSI contrast and reflect real-world situations
much better than measurements of flat white and black images.

Brightness and contrast curve of the EIZO CG2700X - D65 (DUE: Uniformity)
Brightness and contrast curve of the EIZO CG2700X - D65 (DUE: Brightness)

Luminance White (DUE: Uniformity):
Brightness

NativeD65

5800 KD50

100 %446.1 cd/m²

430.2 cd/m²

433.3 cd/m²

439 cd/m²

50 %-

297.2 cd/m²

-

-

0%

-

42.5 cd/m²--

Luminance Black (DUE: Uniformity):
Brightness

NativeD65

5800 K

D50

100 %0.33 cd/m²

0.33 cd/m²

0.33 cd/m²

0.33 cd/m²

50 %

-

0.22 cd/m²

-

-

0%

-

0.03 cd/m²--

Luminance White (DUE: Brightness):
Brightness

NativeD65

5800 KD50

100 %513.8 cd/m²

495.8 cd/m²

499.8 cd/m²

505.6 cd/m²

50 %

-

290.9 cd/m²

-

-

0%

-

42.4 cd/m²--

Luminance Black (DUE: Brightness):
Brightness

NativeD65

5800 K

D50

100 %

0,33

0.33 cd/m²

0.33 cd/m²

0.33 cd/m²

50 %

-

0.19 cd/m²

-

-

0%

-

0.03 cd/m²--

With an almost native white point, we achieve a maximum luminance of over 510
cd/m². So the factory specification does not promise too much here. This means
there is sufficient margin for almost all SDR application areas. We even comeclose to the 640 cd/m² required for sampling according to ISO 3664 P1. Thishigh value is necessary because of the illuminance of 2000 lx required there (forexample for live proofing in the press room).
A contrast ratio of a very decent 1500:1 is maintained across the entire range ofbrightness settings. After switching to DUE mode (Priority: Uniformity), thecontrast ratio drops to a still good 1350:1. The maximum luminance is now
around 450 cd/m².

Viewpoint
The factory specification for the maximum viewing angle is 178 degrees
horizontally and vertically. The figures are based on a residual contrast of 10:1,
which is typical for modern IPS and VA panels. However, further colourimetricchanges are not or only insufficiently included in the specification.

Viewing angle of the EIZO CG2700X
The IPS panel of the EIZO CG2700X convinces with its high viewing angle
stability. Hue and gradation changes are significantly reduced compared toscreens with VA panels. These properties allow large-area display of colourcritical content.
Precautions have also been taken to reduce brightening effects caused by theviewing angle. As a result, this improves the subjective black level even whenviewed from the front, as the image remains more homogeneous towards theedges even at close viewing distances.

Reduced brightening when viewed from the side

Colorimetric tests
Colour space comparison in CIELAB (D50)
The following illustrations are based on the colourimetric data after a calibration
to D65 as white point. The reference white for the preparation in CIELAB is D50(adapted with Bradford).
White volume: screen colour spaceBlack volume: reference
colour space Coloured volume: intersection
Comparison targets: sRGB, Adobe RGB, ECI-RGB v2, ISO Coated v2 (ECI), DCIP3 RGB
Colour space

Cover

ISO Coated v2

99 %

sRGB

100 %

Adobe RGB

99 %ECI-RGB v2

92 %DCI-P3 RGB

97 %sRGB and Adobe RGB are fully covered. The offset printing condition describedby the FOGRA39 characterisation data can also be reproduced precisely. This
makes meaningful proof simulations possible. The comparatively high coverageof ECI-RGB v2, which is often used in media-neutral workflows, is also pleasing.
For use in HDR video workflows, the coverage of DCI-P3 RGB plays a major role.
Here, the EIZO CG2700X is also convincing.

Cover ISO Coated v2, 3D cut 1
Cover ISO Coated v2 , 3D cut 2

Coverage sRGB, 3D cut 1
Coverage sRGB, 3D cut 2

Coverage Adobe RGB, 3D cut 1
Cover Adobe RGB, 3D cut 2

Coverage ECI-RGB v2, 3D cut 1
Coverage ECI-RGB v2, 3D cut 2

Cover DCI-P3 RGB, 3D cut 1
Cover DCI-P3 RGB, 3D cut 2
Measurements before calibration and profiling
Dynamic controls are deactivated, if possible, before the subsequent tests.
Factory setting (colour mode: User)
The factory setting of the EIZO CG2700X is without fault. All the parameters werecorded match the current OSD setting almost perfectly. The grey balance is
excellent.

The detailed test results can be downloaded as a PDF file.
Colour mode sRGB compared with sRGB

The detailed test results can be downloaded as a PDF file.

Adobe RGB colour mode compared with Adobe RGB

The detailed test results can be downloaded as a PDF file.
Colour mode DCI-P3 RGB compared with DCI-P3 RGB

The detailed test results can be downloaded as a PDF file.
The already very positive picture at the beginning continues in the picture modes
we measured. The deviations in the bright colours are very small. The greybalance is also convincing. Appropriate content can thus be reproduced very
attractively without further measures, even in applications that are not colour
management-capable.
Measurements after calibration and profiling
For the following measurements, the EIZO CG2700X was hardware calibrated
and profiled from within ColorNavigator with Priority set to "Standard" (more on
this setting in the "ColorNavigator" section). The target brightness was 140
cd/m². D65 was selected as the white point. Neither of these is a generally valid
recommendation. This also applies to the choice of tone curve, especially since
the current characteristic is taken into account anyway within the framework ofcolour management.
Profile validation (Priority: Standard)

The detailed test results can be downloaded as a PDF file
The EIZO CG2700X shows no noticeable drifts or unsightly non-linearities. The
shaper/matrix profile describes its condition extremely accurately. A repeat ofthe profile validation after 24 hours showed no significantly increased deviations.
All calibration targets were achieved. The grey balance is perfect.
Comparison with sRGB (colour transformed)

The detailed test results can be downloaded as a PDF file

Comparison with Adobe RGB (colour transformed)

The detailed test results can be downloaded as a PDF fileComparison with ECI-RGB v2 (colour transformed)

The detailed test results can be downloaded as a PDF file.
Comparison with DCI-P3 RGB (colour transformed)

The detailed test results can be downloaded as a PDF file.
Our CMM takes into account the working colour space and monitor profile andperforms the necessary colour space transformations with colourimetric rendering
intent on this basis. This works perfectly for the EIZO CG2700X.
In sRGB, Adobe RGB and DCI-P3 RGB, no or at most few out-of-gamut colours
occur due to its large colour gamut. Even in ECI-RGB v2, which is often used inmedia-neutral workflows, the results are decent. Only some strongly saturated
tonal values can only be reproduced approximately by mapping to the colour
space boundary. Compared to many other monitors with an extended colour
space, the risk of tonal value breaks is thus reduced once again.
UDACT ("UGRA test")
Before the test, we calibrated the screen to the following target values, whichcorrespond to UGRA's recommendations for soft proofing tasks (alternatively: L*
gradation):
Destination

Brightness
160 cd/m²

White point (CCT) White point (XYZ, norm.)
5800 K

95.37 100.00 97.39

Gradation
Gamma 1.8

As part of the certification process, the Ugra/Fogra media wedge CMYK ismeasured on the basis of the selected printing condition. Here we define the offset
printing condition described by the FOGRA39 characterisation data (glossy or mattcoated image printing paper). The EIZO CG2700X masters this test without any
problems.

The detailed test results of the UGRA-UDACT can be downloaded as a PDF file.

ColorNavigator 7
Hardware calibration
The EIZO CG2700X can be calibrated using the supplied ColorNavigator software.
Since the scaler or its LUTs are accessed directly, this is a so-called hardware
calibration. Numerous measuring devices are supported. The most popular models
in the prosumer sector are probably i1Pro (1-3), i1Display Pro and Pro Plus from
X-Rite as well as Spyder 4, 5 and X from Datacolor. At the other end of the (price)
scale is, for example, the Minolta CS-2000, which is also supported.
The user first defines a target and then triggers the calibration. It is possible toswitch between already calibrated targets later with a simple mouse click. The
flexible colour space emulation is fully integrated into this process.
In the following, we briefly describe the procedure for creating a new destination
with manual data entry. Alternatively, various other methods can be used: These
include modifying existing targets, reading colourimetric data from ICC profiles,
live measurement of another screen or tuning the white point with regard toambient light or the paper white under standard light.
1. Brightness: The low slider range (60-120 cd/m²) can be overridden bymanual input. This means that the full luminance is also available during
hardware calibration.

Brightness
2. Black level: The black level can be raised in a defined way if desired.

Black level
3. White point: The user can choose between different presets in Kelvin(reference: daylight spotlight, illuminant D) and the individual definition inxy standard colour value components.

White point
4. Gamma (EOTF): Initially, gamma tone value curves (1.0-2.6) and L* aswell as sRGB characteristics are available for calibration. However,individual tone value curves can be defined by specifying a suitable colour
profile or by loading a text file (CSV) with corresponding assignments. In
addition, PQ and HLG gamma curves can be selected and parameterised.
More on this in the section "HDR".

Gamma (EOTF)

5. Priority: The choices under "Priority" control the calibration process. Withthe "Fixed Gamma" setting, only the white point is adjusted on the basis ofconcrete measured values. Necessary corrections in the mid-tones arecalculated by the scaler. "Standard" optimises the grey balance and tone
curve, but does not raise the black level. By choosing "Gray balance", themaximum possible neutrality is achieved. This requires raising the blacklevel to avoid colour casts even in the absolute depths. However, we can nolonger see any improvement here in the already impeccable result.

Priority
6. Gamut: In a colour management-enabled workflow, you will mostly want towork on the basis of the native monitor colour space. This maximises
flexibility. Alternatively, the colorimetric data of the primary colours can be
determined from an ICC profile or by specifying the xy standard chromaticity
coordinates. We explain the option "Gamut Clipping" in the section "Colour
Space Emulation".

Gamut

7. ICC Profile policy: Finally, the colour profile to be created is specified. It
can be saved as v2 or v4 type. CLUT profiles are not generated (onlyshaper/matrix). In view of the excellent linearity, this is acceptable,
especially since the characterisation optionally reflects the actual blacklevel of the monitor.

ICC Profile policy
The target is now calibrated with one of the available measuring instruments. Thisis followed by the profiling. Initially, one memory location is available, but any
number of targets can be assigned to it. Each of these must be recalibrated.
However, each of the predefined image modes can also record individual
calibration data (under any new name if required). Switching is then possible witha mouse click in the task bar. The colour profile in the Windows system folder isalso updated.
Testing tools
After calibration and profiling are completed, a quality control can be carried out.
In the course of profile validation, any RGB test shapes can be created. EIZO alsooffers two presets, one of which implements the requirements defined in ISO
12646. The colourimetric data of the displayed colour patches are then comparedwith the measurement figures resulting from corresponding transformations basedon the monitor profile. This target/actual comparison shows how well thecalibration target was achieved and how precisely the current characteristic was
captured in the profile.
With the EIZO CG2700X, however, CMYK targets can also be measured at thispoint. External software is used to display the colour patches. Therefore, Adobe
Photoshop (from CS1) or Adobe Acrobat (from version 7) must be installed. The
actual measurement takes place fully automatically after manual presettings by
the user. A softproof display with paper colour simulation is always used. The
measured values can thus be compared directly with the target values after a white
point adaptation.
Attention: Unless D50 has been calibrated as the white point, a check box for thecorresponding adaptation must be explicitly activated.

CMYK validation: target definition
CMYK validation: target definitionCMYK validation: Proof simulation and automatic measurement in Adobe
Photoshop

Colour space emulation
To configure the colour space emulation, the desired colour gamut is defined via
the xy standard colour value components of the primary colours (see section"Hardware calibration"). Alternatively, the data can be read from an ICC profile.
In this way, the intended tone value curve is also adopted. Please note that
ColorNavigator recalculates the data adapted to D50 in the profile if a"chromaticAdaptationTag" is available.
The setting "Gamut Clipping" forces a colourimetric transformation. Out-of-gamut
colours are then shifted to the colour space boundary. In-gamut colours are
reproduced precisely. Without gamut clipping, the calibration target is internallyadjusted to be fully covered by the colour gamut of the monitor. This avoids tonalclipping, but reduces the precision of the reproduction of in-gamut colours - under
the premise that a target has been defined that extends beyond the native colour
gamut of the monitor.
In order to guarantee the most correct representation possible even in colour
management-capable applications - here, however, one will usually calibrate
without monitor-internal colour space emulation - the ICC profile with activated"gamut clipping" reflects the emulation target even if the actual monitor colour
space is smaller.
However, the colour space transformations can also be precalculated via a CMM
and automatically written into the LUT pipeline of the monitor. For this purpose,the user selects the desired emulation target in the form of an ICC profile andassigns it to a calibration target. As long as its characterisation information iscorrect, the conversions are performed very accurately and with specified
rendering intent (if supported by the profile). Depth compensation is notavailable. If the monitor profile generated by ColorNavigator reflects the real
black level, slight tonal value breaks may therefore occur in the depths. In thiscase, the corresponding preset ("Reflect black level in tone curve") should be
waived in advance of the selected calibration.

Important: The active monitor profile naturally still contains the colourimetricdata of the parent target. In colour management-capable applications, this leads
to an incorrect display.
A third variant is particularly interesting for professional users in the video
sector. Behind the inconspicuous emulation function "LogView LUT Emulation" isa possibility to load ready-made transformations into the 3D LUT of the monitor.
If only generic CLUTs are available (for example, according to Rec. 709), they
are assigned to a corresponding emulation target.
In the following we have used the colour space emulation from within
ColorNavigator to simulate sRGB, Adobe RGB, DCI-P3 RGB and ECI-RGB v2 with
"Gamut Clipping" activated. The measurements against the respective working
colour space are carried out without colour management. A CMM is therefore notused.

Comparison of sRGB emulation with sRGB

The detailed test results can be downloaded as a PDF file.

Comparison of Adobe RGB emulation with Adobe RGB

The detailed test results can be downloaded as a PDF file.

Comparison of DCI-P3 emulation with DCI-P3 RGB

The detailed test results can be downloaded as a PDF file.

Comparison of ECI-RGB v2 emulation with ECI-RGB v2

The detailed test results can be downloaded as a PDF file.
The colour space transformations are implemented precisely. This enables adefined representation even outside the ICC workflow. The emulation of ECI-RGB
v2 shows the relatively colourimetric rendering intent in the result: tonal values
within the monitor colour space are ideally converted. All other tonal values end
up on the colour space boundary.
For comparison, we have simulated ECI-RGB v2 again with "Gamut Clipping"deactivated. This inevitably leads to increased deviations even in areas that lie
within the monitor colour space. On the other hand, the full tonal range of the
input signal is preserved.

The detailed test results can be downloaded as a PDF file.
Colorimeter correction
The measuring principle on which a colourimeter is based is borrowed from thehuman eye. The spectral sensitivity of the CIE standard observer is simulated byphotoelectric receivers with upstream filters. The design and tuning of the filters(at least three, but often more) are of decisive importance for the achievablemeasurement accuracy. Due to remaining differences, corrective measures arenecessary, which in each case refer to specific reference monitors withcharacteristic emission spectra.
The correction for the supported colourimeters stored by EIZO in ColorNavigatoris hidden in the settings under the item "Measurement Device".

Correction for colorimeter
The deviations between the i1Pro 2 we use as a reference and the i1Display Pro
Plus as a colourimeter are negligible both with and without explicit compensation
setting(s). At the maximum, they are at a Delta E (76) of 1.5, not reverting to XRite's generic characterisation even with compensation disabled. Of course, thei1Pro, no matter in which version, is not an ideal reference. However, the results
show that EIZO also pays attention to this problem and does not use an off-theshelf solution.
Built-in measuring device

The built-in measuring device can be selected as a separate probe inColorNavigator. It allows you to completely dispense with your own measuring
equipment and automatically extends in the upper middle range after activation.

The built-in measuring device in action
For testing purposes, we carried out calibration and profiling with the built-in
measuring device and then validated the profile with the X-Rite i1Pro 2.
Profile validation (built-in measuring device uncorrelated => i1Pro 2)

The detailed test results can be downloaded as a PDF file.
The result is once again convincing. All deviations are at a low level. If you wantto adjust the measurements to an existing probe, you can do this easily using
the correction function. For this purpose, the same series of measurements(RGBW) is run through by the internal and external probes. The results form thebasis for a correction that is automatically applied in the form of a simple 3x3
matrix.
Profile validation (built-in measuring device correlated => i1Pro 2)

The detailed test results can be downloaded as a PDF file.
Using the built-in measuring device, the EIZO CG2700X can be recalibrated on aregular basis. This increases the precision between complete calibration andprofiling runs via ColorNavigator, which also need to be carried out lessfrequently.
The configuration is simple. If one has already calibrated the screen, thenecessary parameters are directly noted. The user only has to set the desired
time interval.

Profiling of other display devices (e.g. tablets, smartphones)
Another interesting function is the profiling of external screen devices such astablets or smartphones. The test fields are displayed fully automatically on thetarget device via internet browser. The necessary network port is specified by theuser during configuration. The results can be saved as a matrix or LUT profileand of course also used for colour space emulation.

Profiling of further display units

HDR
EIZO did not have the CG2700X specified according to VESA DisplayHDR.
Nevertheless, our test device also scores in the area of HDR reproduction.
Technically comparable competitor models with DisplayHDR-400 specifications
are even clearly outperformed. Although this is not yet enough for professional
HDR colour correction and retouching, EIZO makes full use of the panel andmakes it possible to reproduce demanding HDR material.
The VESA specifications provide for the HDR10 format as the transmission
standard. The signal to be processed has the following properties at its core:••••

10 bits per channel.
Absolute tone curve according to SMPTE ST 2084.
Colour gamut according to ITU-R BT. 2020.
Processing of static metadata defined in SMPTE ST2086.

The absolute tone value curve is based on a basic concept that has long been
known from the medical field (DICOM). The objective is maximum coding
efficiency even under unfavourable conditions (an eye that is always brightnessadapted to assess a minimum difference). There is plenty of room for
improvement for the maximum brightness. The same applies to the colour
gamut, which could only be achieved with monochromatic primary colours. The
VESA takes this into account and defines DCI-P3 RGB as the reference colour
space.
The display technology is a good deal behind this transmission standard.
However, metadata relating to the specific mastering characterises the material
in a rudimentary way. The monitor's scaler can then make an adjustment. In thefollowing, we will concentrate primarily on HDR10 reproduction.
OSD and ColorNavigator make the PQ transfer function available. The settings
include:•••••300 cd/m² clipping
500 cd/m² emulation
1000 cd/m² emulation
4000 cd/m² emulation
10 000 cd/m² emulation

The implementation promises accurate reproduction up to 300 cd/m² for the
single clipping setting. Beyond that, of course, differentiation is no longer
possible. The emulation settings differentiate up to the eponymous thresholdvalue. Naturally, the precision decreases with increasingly higher values. Aninteresting feature is the colour highlighting of areas that exceed the thresholdvalues listed above.
The APL for the subsequent measurements was always below 50 % due to theselected measurement field size. However, the EIZO CG2700X reaches its
maximum luminance even with a full-surface display.

Configuration PQ transfer function in ColorNavigator

PQ 300 cd/m² clipping

PQ 300 cd/m² clipping
PQ 1000 cd/m² emulation

PQ 1000 cd/m² emulation
PQ 4000 cd/m² emulation

PQ 4000 cd/m² emulation
In the graphics, the target characteristic is deposited as a light grey curve. It isbased on the measured maximum brightness and from there follows the PQ
transfer function (according to SMPTE ST 2084). This results in a more or lesslarge clipping range for all real monitors, as the maximum 10 000 cd/m² are notreached.
All settings live up to their name. However, with the 4000 cd/m² emulation at
the latest, the tone value curve is inevitably lowered to such an extent that evenhalfway sensible sampling is no longer possible under the given parameters.
The brightness setting should definitely be 300 cd/m². Deviating values lead to aloss of precision because the calculations are always based on this maximum
brightness. Unfortunately, this also applies to hardware calibration.
PQ 300 cd/m² clipping - luminance: 400 cd/m²

PQ 300 cd/m² clipping with 400 cd/m² luminance
The tone value curve now no longer follows the target characteristic, but isalways slightly above it.
In the following, we have prepared the results for the setting "300 cd/m²
clipping" after the hardware calibration.
PQ 300 cd/m² clipping - hardware calibration

PQ 300 cd/m² clipping after hardware calibration
The result after the HDR hardware calibration is also fully convincing. The desired
characteristic is achieved extremely precisely - and with almost perfect greybalance.
Based on the colour space emulation, we finally carried out a more extensive
series of measurements. For this purpose, in ColorNavigator the PQ transfer
function with the setting "300 cd/m² clipping" and a colour gamut according to
ITU-R BT. 2020 with "Gamut Clipping" was selected (HDR10-compliant). Since
the colour gamut of the material generally does not exceed DCI-P3 RGB, noadditional tonal value breaks are to be expected despite the extensive gamut
clipping. Corresponding out-of-gamut colours are simply not included.
Unfortunately, EIZO does not offer a corresponding predefined picture mode
here. The "PQ_DCI-P3" mode offered in the OSD uses a DCI-P3 RGB emulationand implements the PQ transfer function in the 1000 cd/m² clipping setting.
Hardware calibration: PQ 300-cd/m² clipping, ITU-R BT. 2020 ("Gamut Clipping")
Red
dE 94

Green
2,3

Red2
dE 94

0,8

Green20,5Gray35
dE 94

Blue
0,4

Blue2
0,7

Gray50
0,6

Cyan
0,3

Cyan2
0,8

Gray800,9Magenta0,2Magenta2
0,8Yellow0,4

1,0

Yellow2
0,8

White
0,6

0,0

Colour deviations PQ 300 cd/m² clipping and ITU-R-BT.2020 emulation ("gamut
clipping") after hardware calibration

In contrast to SDR measurements, the reference point for the evaluation is not
the white point at maximum brightness, but an area white with only around 100
cd/m². Here we assume a complete visual adaptation (adjustments via
Bradford). Only colour patches are used that are within the colour gamut of DCIP3 RGB but are encoded in ITU-R BT. 2020 are encoded.
Once again, the EIZO CG2700X can live up to all expectations. Its colour
reproduction shows no weaknesses. This again applies almost unreservedly tothe results without prior calibration.
In addition to the PQ transfer function, the EIZO CG2700X also supports the HLG
characteristic ("Hybrid Log Gamma"). This is a relative tone value curve. HDR
material encoded accordingly has the advantage of still being reproduced
reasonably acceptably on an SDR reproduction device with characteristic gamma
2.4 (2.2) (the peak highlights are strongly compressed at the "upper stop"). The
metadata-free HLG is therefore mainly used for TV broadcasts.

Reaction behaviour
We tested the EIZO CG2700X in native resolution at 60 Hz on the DisplayPort
connection. The monitor was reset to factory settings for the measurement.
Image build-up time and acceleration behaviour
We determine the image build-up time for the black to white change and the best
grey to grey change. In addition, we give the average value for our 15 measuring
points.
The data sheet specifies a response time of 13 ms (GtG). The EIZO CG2700X does
not implement an overdrive function.
The switching time diagram shows, among other things, how different brightness
jumps add up, how fast the monitor reacts in the factory setting in the best caseand what average reaction time can be assumed.
The measurement Color to Color (CtC) goes beyond the conventional
measurements of single-colour brightness jumps, after all, one usually sees acoloured image on the screen. This measurement therefore measures the longest
period of time that the monitor needs to change from one mixed colour to theother and stabilise its brightness.
The mixed colours cyan, magenta and yellow are used - each with 50 % signal
brightness. With the CtC colour change, not all three subpixels of a pixel switch
in the same way, but different rise and fall times are combined.
Switching times
We determine the black/white change with a very leisurely 25.2 ms and thefastest grey change with 18.2 ms. The average value for all our 15 measuring
points is 30.1 ms. The CtC value is slow at 24 ms. The brightness curve (GtG 8050 %) is of course completely neutral.

Slow switching times
Completely neutral tuning
Network diagram
In the following network diagram you can see an overview of all the measured
values for the different brightness jumps of our measurements. Ideally, thegreen and red lines are close to the centre. Each axis represents a brightness
jump of the monitor defined in level and dynamics, measured via light sensor
and oscilloscope.

Network diagram

Latency
The latency or signal delay time is an important value for gamers, as low values
guarantee direct feedback. The signal delay at 60 Hz is very short at only 3.3 ms.
The total latency is a leisurely 18.4 ms.

Backlight
The backlight of the EIZO CG2700X is not regulated by pulse width modulation(PWM). There are no interruptions in the luminous flux in any operating state,
which could be perceived as flickering at low frequency. This makes the monitor
suitable for longer working sessions even for sensitive eyes.

LED backlight without PWM brightness control

Evaluation
Housing processing and mechanics:

5

Ergonomics:

5

Operation/OSD:

5

Energy consumption:

2

Noise generation:

5

Subjective image impression:

5
5
5
4

Viewing angle dependence:Contrast:
Illumination (black image):
Image homogeneity (brightness distribution Uniformity Comp.:
On; Off):
Image Homogeneity (Colour Uniformity Comp.: On; Off):
Colour space volume (ISO Coated v2; sRGB; Adobe RGB; ECIRGB v2, DCI-P3 RGB):

5; 5
5; 5

5; 5; 5; 4; 5

After calibration (sRGB):

55
5After calibration (profile validation):

5Interpolated image:

4

Suitable for casual players:
Suitable for hardcore players:
Suitable for DVD/Video (PC):3
1
5

Suitable for DVD/video (external feed):5

Price-performance ratio:

4

Price [incl. VAT in Euro]:from €3,200

Overall ranking:

4.5 (VERY GOOD)

Before calibration:
Before calibration (sRGB):

Conclusion
The EIZO CG2700X is a real enrichment of the renowned ColorEdge product line.
Thanks to its UHD resolution, it also opens up to user groups for whom the pixel
density of the CG2700S was previously not sufficient. Moreover, both models areeasily comparable with each other. You have to look for real weaknesses with amagnifying glass. The most likely place to find them is in the response time. No,
games are not the profession of the graphics professional from Japan. The
inconspicuous monitor is all the more convincing in almost all other areas.
The high-resolution, viewing-angle stable and comparatively high-contrast IPS
panel forms an ideal basis on which EIZO can build with its development knowhow. Thanks to DUE, its surface homogeneity is excellent, while its high colour
gamut enables the most demanding image retouching and colour-safe proof
simulations. Of central importance is also the in-house developed scaler, which
processes the input signal loss-free and with high precision. With ColorNavigator,a software for controlling the hardware calibration is available that leaves hardly
anything to be desired after a short training period. The integration of a colour

space emulation into the calibration process ensures maximum colour reliability
even in applications that are not colour management-capable.
The built-in, well-tuned measuring device makes a separate probe superfluous inmost cases. Self-calibration ensures compliance with calibration targets over timeand can meanwhile even be started during operation.
Although the CG2700X is not aimed at demanding HDR workflows, we like theparameterizable PQ and HLG transfer functions. Simple control tasks are thus quitepossible. A small downer is the limitation to a luminance of 300 cd/m² formaximum precision. The panel has considerably more reserves.
With an RRP of around 3,000 euros, the EIZO CG2700X is in the upper pricesegment. A lot of performance for a lot - but not too much - money. In aprofessional environment, this investment will quickly pay for itself.

Note: PRAD received the CG2700X on loan from EIZO for testing purposes. The
manufacturer had no influence on the test report, no obligation to publish it andno confidentiality agreement.
Link to the original test report:
https://www.prad.de/testberichte/test-eizo-cg2700x-grafik-profi-mit-uhdaufloesung/© 2023 PRAD ProAdviser GmbH & Co. KG