yashsingh1/xdaforums huggingface dataset:
[Nexus 5 General] epithetic:
That's actually a rather good description of it, albeit slightly exaggerated.

The overwhelming majority of consumer content, digital imagery and electronic displays these days is standardised to sRGB, D65/6500K and 2.2 gamma. That is to say, encoding and decoding and eventual display of content will follow these conventions.

If you think of the ideal display as a mirror (original image = displayed image) it will have to match the parameters content was originally created in mind with (or convert the image accordingly).

For example, if I take a picture in an Adobe RGB colour space/system and display it on a sRGB screen without any further correction I'm not going to see the image as intended. Your image will look desaturated and washed out because Adobe RGB encodes a wider gamut for the same values than sRGB does. The same is true for gamma, white point, etc. If you create content/encode content under "set of parameters A" and decode under "set of parameters B", how closely those two sets align is how similar input and output will appear.

Or more simply put, if I draw an image to look right on a really washed out, green tinged screen and then copy it over to another screen that isn't really washed out and green tinged it's probably going to look very different (and very terrible). Which is the idea of colour management & correction in the first place, by making sure that different displays (which by nature behave differently) lead to a consistent output throughout.

Now some people might like inaccurate colours (there's a reason why manufacturers such as Samsung/LG/Sony/etc. go for sometimes crazy "calibration" with their screens!) but they're still going to be a reproduction of content markedly different from what was intended or originally imaged (e.g. like a blue tinted mirror).

Less of a problem for pure consumers and especially mobile devices (because if you're just looking at the end result you can get used to things looking different, or even prefer that) but if you create content (be it web design, photography, digital art, etc.) you really want a display that will reflect what you're going to see on other devices/etc. as inaccuracies just love to accumulate and multiply.
[Nexus 5 General] neriamarillo:
Awesome information you took your time with, but... You know he was trolling right?
[Nexus 5 General] epithetic:
I thought so, but for the sake of the original question elaborated anyway.
[Nexus 5 General] Tzfardaya:
Me? Trolling? Whatever do you mean... :angel:
[Nexus 5 General] Mythos123:
[MENTION=4809179]yorici[/MENTION]

I'm using your punchy profile and loving it, thank u very much!

any progress on the calibrated_accurate profile?

Nexus 5 & Tapatalk.
[Nexus 5 General] yorici:
I have been on vacation and been moving out, so I forgot about it (*sorry*). I'll continue again today
[Nexus 5 General] Mythos123:
no probs mate, it's important to recharge your batteries! [emoji6]

Nexus 5 & Tapatalk.
[Nexus 5 General] Chaplan:
[MENTION=4809179]yorici[/MENTION] have you tried uber kernel? I believe you profile on franko's is a bit different than in uber...
[Nexus 5 General] yorici:
I'll check
[Nexus 5 General] yorici:
Not seeing something out of the ordinary? What do you see?

Maybe check for interfering apps (two apps trying to set different profiles)?
[Nexus 5 General] Chaplan:
Using only synapse + script. Removed uber init.d. I usually choose iPhone profile to check if the color profiles are being applied and on uber this profile is different. Instead of being greenish on the whites, it is blueish.

I have checked and the profile has the same values.

UBER-N5-SM-4.10.0-Faux-08-20-2014 is the kernel I am using.

You profile doesn't seem to look the same as on Franko either.
[Nexus 5 General] yorici:
Fun thing is, iPhone looks yellow on my screen at 100% white. Which is correct when looking at the data. Make sure you look at full white/correct greys?

(The color you should see is yellow combined with a half cyan. You could argue that is greenish. But it's more yellowish to me and according to the parameters)
[Nexus 5 General] Moh_Jay:
The iPhone profile was made as a joke...
[Nexus 5 General] Chaplan:
Yes, i know that, but it is the best way to see how off the profile is applied.

---------- Post added at 05:56 PM ---------- Previous post was at 05:52 PM ----------

[MENTION=4809179]yorici[/MENTION] I have to thank you for your help on this matter. Yes, the iPhone profile has the whites yellow, for me a bit to the greenish but that is peanuts. If I apply iPhone profile with Franco's app I get the yellow color. If I use sinapse, and I had uninstalled Franco's app before this, the whites are all blue. The problem must be in synapse and not on uber itself... Can I ask you if you can test this??? I would really like to get to the bottom of it...
[Nexus 5 General] yorici:
Ah, then I know what the problem is. I didn't know synapse could apply colors. This is the problem: FKU applies the profiles in this order: blue neg - blue pos - green neg - green pos - red neg - red pos - whitepoint. This is a reversed order and it is very confusing. This must be reversed because the kernel code was made this way. Tell the synapse devs that they need to reverse the order.

Fku and fauxclock both had this problem too, so my best guess is this.
[Nexus 5 General] Kaemo:
Glad to see this thread is active again! Can't wait for Accurate to come, but no rush. :)
[Nexus 5 General] nabil alami:
I didnt test them all but insanity seems pretty good :D
[Nexus 5 General] Jamith:
I join the waiting list, meanwhile I stayed with the punchy one. Thanks for you effort
[Nexus 5 General] yorici:
Hi guys, didn't have too much time this week and next week is first week of University. So I can only offer an Alpha version. Just gives a raw idea how things will look. The highlights are sorta calibrated. Not perfect.

I'm sure a lot of you will find this to be "yellowish" coming from Yorici_Calibrated_Punch, but that's because it's a 6500K instead of a 8500K profile. But same applies for stock. So if you found stock to be yellowish, you are going to find this yellowish too.

I'm also curious what other colorimeters will say of this profile on another display.
[Nexus 5 General] Chaplan:
I would say it is a bit yellowish as stock, but it has a bit more of contrast and saturation on it. Stock is to lame... No contrast whatsoever.

Somewhere between calibrated punch (just a little blue on the whites) and accurate alpha lyes the perfect profile for my nexus 5 (this is my personal opinion)

Thanks for your great effort/work on setting the definite profile for our devices...
[Nexus 5 General] mrvtec69:
i agree with above comment maybe 7000K would be the sweet spot, slightly cooler but still warmer then 8500k
[Nexus 5 General] Tzfardaya:
Except that 6500K is industry standard/spec for calibrated displays... A. K. A. sRGB which is what yorici is trying to match...
[Nexus 5 General] ali262883:
Where will i get the link for the latest profiles? All profiles?
[Nexus 5 General] bblzd:
BTW Stock Nexus 5 is about 7050k on the white point average. Not sure about any "yellowed" screens though.
[Nexus 5 General] yorici:
Well that is a very wrong assumption.

This measurement is taken on one point: the white point (255,255,255). You don't know what the other points got measured for.

This is taken on one phone. Phones differ a lot when thousands are produced.

This was measured with this colorimeter. Colorimeters need to be calibrated too. Different types of colorimeters get different results.

AnandTech isn't the most reliable source imo too..

Now that is that, I have received and collected different measures of the stock profile and they range from 6000 to 7000. I dare to say if you would take the average it would get you around 6500K. Atleast not 7000..
[Nexus 5 General] bblzd:
AnandTech isn't a reliable source? Really? You might be the only person I know of with that opinion. Perhaps you just don't realize how long they've been around, or how they're one of the last remaining hardware sites that still does proper testing. Very professional and very accurate in all their readings, measurements, and comparisons, and completely transparent with their testing methodologies. If you can name me even one other mobile hardware site that normalizes brightness values (measured in NITS) before comparing devices I'd love to hear about it.

Yes it's just one phone but that's the best we got. If you have more numbers to compare that have also been accurately measured I'd love to see it.

As for average being 6500K, that would mean half the phones you tested are below 6500k. If that is true, those must be the yellowed screens that people have been complaining about. No display should be below 6500k IMO.
[Nexus 5 General] yorici:
I have my own reasons not to take their results as representative for the Nexus 5 immediately. If I were to criticise the Nexus 5 Display Analysis:

-He doesn't mention what colorimeter he uses which is important for the quality of the measurement.

-The units are far too precise: 436,1000. I just hope this is an average.. But he doesn't mention how many measurement he has done. If you would have a colorimeter and have experimented with it you know this number has too many decimals. Usually the measurements are far more roughly.

- That aside, he only shows two points: The white point and the black point. He doesn't show the 254 other points... Seems a bit unfair to me. He does show Grayscale DeltaE of course, but DeltaE can be so deceiving.. He also doesn't mention at which brightness which measurements are done.

But I get this, because those numbers are ment for the common phone user. So the choices he made are understandable. (Not talking about the dE's and all the graphs for example). I just don't appreciate them.

(Also, he should have used the term luminance instead of brightness imo. Brightness is perceived luminance and it's usually correct talking about brightness when related to your eyes. (And since he is using a colorimeter...) Luminance has the official unit of cd/m2 though, not Nits.. But brightness appeals to more readers than luminance. Once again, understandable, but not accurate.)

But I won't turn this in to a *****fight about which site is better. I appreciate that AnandTech is doing this. And you are right to say that there aren't many people/sites doing this. (If I do have to mention more people doing this: Erica Griffin).

But that isn't the original point. They don't have multiple Nexus 5's and their measurements can't be held as 100% representable for the Nexus 5. Neither are mine btw. I just happen to have collected multiple measurements from different people with different phones. And I conclude that the average colour temperature is around 6500K. Yes there are people reporting lower than 6500K. Doesn't immediately mean that they have yellow screens.. When I get back to my laptop I'll gather them around so you can see.
[Nexus 5 General] Luigi_2:
whatever correct profile you're working on, i demand it now, final or not!!! :D
[Nexus 5 General] bblzd:
Thanks for your detailed response and I look forward to seeing your results. Of course they're not going to include 255 white balance charts as no review is going to spend 100+ pages on one thing so yes they have to pick and choose which information they visualize for their audience.

Every test is done multiple times and averaged out. 200 nits is the brightness level each phone is normalized to. I'm not sure which colourmeter they're using at this point but as one of the last remaining reputable sources (IMO) for this kind of stuff I can rest assured it's something decent. Drop Brian Klug [MENTION=589869]nerdtalker[/MENTION] a tweet if you'd like, they seem fairly responsive over there.

If you have any other sources for this kind of detailed breakdowns I'd truly love to see it. Erica Griffin's youtube videos seem fairly well informed but her format of presenting information does not appeal to me. Otherwise, mobile display analysis is pretty rare and one can never have enough sources.

Displaymate themselves do some incredibly detailed break downs but they don't cover very many devices and there could be some conflict of interest at play there.
[Nexus 5 General] Piereligio:
Hi, guys. I Can't find my profile's .chc file. Where do I find it? It seems to be offline..

I need to know the contrast ratio and the nit value with my profile loaded..
[Nexus 5 General] yorici:
I got 973 vs 1022 on Yorici_Calibrated_Punch. That is just due to white point (32 vs 31). The other parameters are properly setup for highest contrast possible! (I just did a quick 5 sample test, so raw indicator). I did comparison so you know how much you are away from the peek: 95%

The figure itself is very pixel dependent. I can get 930 to 1025 with your profile on different pixels..

Luminance: Usually around 480 (R: 400, G: 490, B: 580)
[Nexus 5 General] yorici:
You can visualise those 256 points in one chart;)

Reason why I distrust DisplayMate for example:

On Galaxy S5's cinema mode:

Erica Griffin (fiance of Francois Simond, expert on this topic): https://plus.google.com/+EricaGriffin/posts/2KnJKTZe6mn

DisplayMate: http://www.displaymate.com/Galaxy_S5_ShootOut_1.htm

DisplayMate doesn't seem to provide the data, so I'll go with Erica on this one..

My opinion is that you should measure the devices you have yourself. The data from others is always biased in some way as you have/will get a different phone with a different display. I'm sure my profiles will suck on some other phones too..

What you can indicate with the data is what the manufacturer had in mind when calibrating it.
[Nexus 5 General] bblzd:
Considering how many phones they are comparing, that would be one large chart! :D

It's interesting that you were dissatisfied with the GS5 display analysis by DisplayMate because I also felt there were inconsistencies between their results and Anandtech's. DisplayMate seemed to give it much praise going as far as to say "the Galaxy S5 is the Best performing Smartphone display that we have ever tested." which might be true based off the small and predominantly OLED test samples, but they fail to mention the pretty obvious green tint to the display in grayscale.

Anyways. Thanks again and I look forward to your results.
[Nexus 5 General] ali262883:
Where can i find the link to leo 2.3 profile?
[Nexus 5 General] epithetic:
Yeah, I'd like to add my vote to "questionable"/not necessarily representative as far as that measurement goes.

My Nexus 5 on stock hovers around 6200K for most of the curve (slightly cooler towards 100%). It's not so much "yellowed" as slightly greenish (red & blue are comparatively close).
[Nexus 5 General] Chaplan:
In what order are colors saved on a profile file?
[Nexus 5 General] epithetic:
B+ [...]

B- [...]

G+ [...]

G- [...]

R+ [...]

R- [...]

White point
[Nexus 5 General] Chaplan:
I thought it was in that order, but negatives came first, are you sure it is this the right order?

Yoricy gave me this answear a while ago but i don't really know if this is from the way it is applyed, or if it is the order of tghe file to.
[Nexus 5 General] yorici:
That is the order in which the videodriver is written and all the apps should apply to bw compatible: negs first
[Nexus 5 General] Chaplan:
# 7.1 GAMMA PRESET

if [ $GAMMA_PRESET -eq 1 ]; then

# Red Positive = /sys/module/dsi_panel/kgamma_rp

echo "0 18 23 36 45 54 63 81 91 107 118 126 124 118 110 93 73 56 43 36 25 10 5" > /sys/module/dsi_panel/kgamma_rp

# Red Negative = /sys/module/dsi_panel/kgamma_rn

echo "0 18 23 36 45 54 63 80 91 107 118 126 124 118 110 94 74 57 43 35 26 10 5" > /sys/module/dsi_panel/kgamma_rn

# Green Positive = /sys/module/dsi_panel/kgamma_gp

echo "0 20 31 43 50 57 67 84 95 111 120 128 122 116 109 93 73 55 41 34 24 10 5" > /sys/module/dsi_panel/kgamma_gp

# Green Negative = /sys/module/dsi_panel/kgamma_gn

echo "0 20 30 43 50 57 67 85 95 110 121 128 122 116 108 94 74 55 43 35 26 10 5" > /sys/module/dsi_panel/kgamma_gn

# Blue Positive = /sys/module/dsi_panel/kgamma_bp

echo "0 14 19 33 41 46 60 77 88 105 116 123 125 119 111 95 76 57 41 36 24 15 5" > /sys/module/dsi_panel/kgamma_bp

# Blue Negative = /sys/module/dsi_panel/kgamma_bn

echo "0 14 18 31 41 47 59 77 88 105 116 125 125 119 111 95 75 56 48 37 26 15 5" > /sys/module/dsi_panel/kgamma_bn

# White Point = /sys/module/dsi_panel/kgamma_w

echo "31" > /sys/module/dsi_panel/kgamma_w

[MENTION=4809179]yorici[/MENTION] can you please check if this is the right order to make your profile work?

I'm trying to get it to work on UBER Kernel, without any app, just changing his profile to yours.

The question i am asking is in what order are the lines on the profile files, so i can put those values on the config file for the kernel.
[Nexus 5 General] yorici:
Well, every app applies it like the videodriver states: blue neg - blue pos - green neg - green pos - red neg - red pos - whitepoint. My bet is on this order
[Nexus 5 General] eluspo:
Loving the calibrated punch. Thanks a lot!
[Nexus 5 General] dmillerzx:
Just loaded the alpha today. Seems very nice so far. Came from V3 previously!! Keep up the great work
[Nexus 5 General] ali262883:
Which? Where?
[Nexus 5 General] Hatshipuh:
The only alpha, in this thread, obviously.
[Nexus 5 General] antypas:
Tried the alpha too.

Although it was stated that is should look as warm as the stock profile actually it looks much warmer.

It really makes the screen warmer (red) whereas with the stock setting the screen looks plain white.
[Nexus 5 General] ali262883:
+1

I haven't tried the alpha, but there is a yorichi profile in the aroma installer of Linaro kernel, its almost perfect but reddish.. Its clearly noticable.. But still better than blue..
[Nexus 5 General] yorici:
That is probably Yorici_V3 and that profile should have been deleted.. It has been made a long time ago when I didn't have a clue what the parameters ment.
[Nexus 5 General] ali262883:
Ohh.. So any updated profile? I use this v3 currently
[Nexus 5 General] yorici:
Yorici_Calibrated_Punch is for max brightness and contrast.

Yorici_Calibrated_Accurate_Alpha is as alpha already better than V3 for the purpose of having a 6500K screen
[Nexus 5 General] ali262883:
Okay [emoji106]

---------- Post added at 02:31 PM ---------- Previous post was at 02:28 PM ----------

I see only accurate punch in the OP.. Where can i find the alpha?
[Nexus 5 General] yorici:
http://xdaforums.com/showpost.php?p=55127727&postcount=217

It's not in the OP bc it's an Alpha and not a final product or atleast a beta..
[Nexus 5 General] ali262883:
Thanks thanks

---------- Post added at 02:51 PM ---------- Previous post was at 02:45 PM ----------

The profile is excellent.. Near perfect.. Very less yellow and almost as good as my friends htc one, thank you so much.. Will be waiting for final product
[Nexus 5 General] Pretoriano80:
For me the Alpha profile is almost as Mag01,a bit reddish on my device.
[Nexus 5 General] Jeeza:
Hi Yorici!

Thanks for the thread, I am a photographer so I like all my screens calibrated ;)

But I don't understand the calibration procedure very well, even after reading the guide multiple times.

I'd like to use DisplayControl to calibrate, since you say you can use that app in the "Easy part" section.

Now I'm on Step3: the first parameter". Exactly what is this "first parameter"?

Attached the screen of the DisplayControl app.

Since we're talking about red, is the first parameter one of these sliders?

Is this app only useful for profiles but not for calibrations?

Thanks!
[Nexus 5 General] Tzfardaya:
First question I have for you is, do you have a colorimeter? You can't do an accurate calibration without one...

But in this instance what he's referring to as profiles are the various setting that people have created for the device... Calibrated or otherwise...

One of closest calibration profiles (depending on your device) is yorici's punch, linked in this thread somewhere...
[Nexus 5 General] Jeeza:
Yes I have a Spyder4 pro, which I managed to con figure correctly in HCFR..I meant to say it in my prev post bit I forgot :P
[Nexus 5 General] Tzfardaya:
Good good, same one I have... No impressed with Datacolor btw... If you're just looking for a way to display your pictures properly calibrated on your phone... They claim their spydergallery is now working on kitkat...
[Nexus 5 General] Jeeza:
Didn't know that they have an app! Installing it now!

----------------------

Ok installed on phone and pc..as expected the drivers I used to make it work with HCFR aren't conpatible with the official programs...

Ok I need help with HCFR ;)
[Nexus 5 General] yorici:
Hi, you can use Display Control if you like to. The first parameter is what you like to be. Usually it's the first red parameter. Just download the images and Display Control and you are ready to go.
[Nexus 5 General] Jeeza:
Thanks yorici! I guess the only thing to do to learn is try myself :)

In Display control what's the difference between the "curve" slider and the "brightness" slider?

About the difference between positive and negative, I assume that the former influences the higher end of the curve and the latter the low end...does this makes sense?
[Nexus 5 General] yorici:
Omg, I'm sorry. The Display Control app is useful for saving progress in profiles. I normally use FKU so I forgot about DC. You should use N5 Gamma App from xda. Link is in my OP I believe. There you will have much more parameters and the OP will become clear.
[Nexus 5 General] Jeeza:
Do you mean THIS app?

I'm gonna try it when I have enough time ;) thanks!

-------

DL link seems to be broken :(
[Nexus 5 General] yorici:
Yes and DL link is working for me.
[Nexus 5 General] Jeeza:
OK things are a little clearer now :)

So let me post a pair of screens, just to confirm that I understood everything ;)

The phone screens is your calibrated profile alpha, which I use as a starting point.

The pc screen is your spreadsheet with the max luminance I gor from HCRF.

There I can see the reds are higher than the other two, which I have to increase.

To do this I must go IE in the green positive tab in the N5 app and DECREASE the first 12 values (before the red line) and INCREASE the last 13 values.

I leave the negative tab as is, which is for finer tuning.

When I edited all the tab for green and bue I redo a scan in HCFR and insert the new values in the spreadsheet.

Please correct me if I said anything wrong!

But now a few questions comes in my mind:

- I'm looking at the pics in the (recommended) folder: when I do a free measure of "a-p1" and insert the values in the spreadsheet, should I use these values only to tune the firse parameter in N5 app, and ignore the others?

Similary, when I do "c-p2" I should only care for the "value2" of the spreadsheet?

- How to change color temperature? Since when R=G=B temperature is 6500, which values make the temperature increase anda decrease?

Excuse me for the maybe silly questions, but I'm really interested in understanding this process very well :)

I've been a little of a maniac about color calibration, and when I heard you could do it on the N5 I went nuts :laugh:

Thanks Yorici
[Nexus 5 General] dmillerzx:
Yorici, is the profile 'Yorici_Calibrated_Accurate_Alpha profile still the most recent / what you recommend? Thanks.
[Nexus 5 General] Tzfardaya:
Yes/depends
[Nexus 5 General] Piereligio:
I recommend TrueRGB. :P ahahah
[Nexus 5 General] giant22000:
I would definitely recommend Piereligio_TrueRGBv4.4. For me, this color profile has been the best color profile by far on my N5!

Sent from my Nexus 5
[Nexus 5 General] endursa:
The calibration on the newest lollipop release is extremly perfect at 2.0, google did tweak the display to its best!
[Nexus 5 General] ali262883:
Can u link me

---------- Post added at 02:23 PM ---------- Previous post was at 02:19 PM ----------

Can u link ke v4.4?
[Nexus 5 General] Bl4ck3urn:
easy find: http://d-h.st/9UH
[Nexus 5 General] ali262883:
Is this latest one? Because there are versions even after 4.4.. Till v7
[Nexus 5 General] fchowd0696:
Is there a way to calibrate the screen on the new l release?