Talk:Image resolution

message: Now that I have boldly added sections on bit depth and linked to the chroma subsampling stub, does this need disambiguation, or are they subtopics?  Ehusman 22:36, 4 December 2005 (UTC)
thread_title: Comments

message: In the dynamic range section, it currently states, "Bit depth can impact dynamic range capability if you include the caveat of banding or contouring issues. If you have an insufficient bit-depth for a given dynamic range, the discrete steps between one level and the next can become distinctly visible, and gradations in the image will not appear smooth; instead they will have visible banding problems.". Surely it is refering to posterization, not banding? From my experience (specifically with digital cameras), banding has been vertical or horizontal lines relating to the reading of CCD/CMOS lines from the sensor. So, should this term be replaced? Posterization has a relevent article, and banding does not. Diliff   | (Talk)   (Contribs) 09:13, 23 May 2006 (UTC)
thread_title:  Banding.. is this the right term? 

message: The article states that "DVDs have roughly 500 lines" but is an approximation necessary?  NTSC DVD's have exactly 480 and PAL exactly 576.  Why not just state that?  I would make the edit, but then I'm not certain if there's some technical reason for the approximation.
Also the article refers to common frame rates of 15 or 30 frames per second.
These may be common for NTSC but as I recall 24fps is common at the cinema and 25fps common in Europe (specifically the uk).
92.40.253.169 (talk) 22:03, 14 March 2012 (UTC)
replies: text: I agree, this would make more sense.  Do you have a source?  I know you're right about the figures, but this article has been slack with sourcing things.  I'll look for one if I have a chance, but I don't right now.  Micahmedia (talk) 03:07, 8 April 2012 (UTC)
thread_title:  NTSC DVD's have 480 lines of resolution 

message: The article used to list the number of lines of resolution horizontally and and the number of lines vertically and then multiply them for the number of megapixels. Now "columns" and "lines" are used incorrectly. When you talk about lines of resolution you have to mention whether they are in the vertical axis or the horizontal axis
:I'm not familiar with lines being used other than in the sense of how many horizontal lines can be resolved.  If you have a different interpretation, find a source, and put it in the article; after that the examples can say which method or interpretation they are using. Dicklyon 17:01, 3 September 2006 (UTC)
replies: text: "Line" just means a line in any direction (including non-right angles, like on a vector CRT,) a vertical line of pixels is called a column and a horizontal line of pixels is called a row. As for references, look at the article; second subhead, about halfway down the first paragraph. You can't miss it. :-) 208.54.14.81 18:30, 3 September 2006 (UTC)
replies: text: Feel free to think of me as slow, but I'm not finding what you're referring to as a reference.  And your interpretation of "line" is not one that I am familiar with in the context of resolution.  How about a citation?  Here are some examples of bookw with lines as used in this article:      That last one has "horizontal lines of resolution" for what you're calling columns, I think, but none cite image resolution in terms of rows and columns; that's more of a "pixel resolution" thing which is not an actual resolution; unfortunately, it's what a lot of the examples are about, like the 35mm movie film scanners.  This could use some clarification, for sure, but simply swapping out lines is not the answer. Dicklyon 21:48, 3 September 2006 (UTC)
thread_title: Confusion

message: Hello, colleagues! I agree, the article is confusive.
It is not because you did not edit it well, it is because the term has too many meanings.
For example, what does mean each of the sentences below?
 (A) The resolution of this microscope is 1 micron.
 (B) We need to increase the resolution.
 (C) At ~\rm NA=0.2~, the model predicts the resolution  r = 300 \rm \frac{lines}{mm}.
First at all, should we treate resolution as some physical quantity like length of frequency,
or it is just fussy term like beauty or generosity?
(Perhaps, beauty is not a good example, this term may be in use in quantum chromodynamics,
where physicists have to give names to new fundamental quantities.)
If we treate the resolution as physical quantity, we should state that in the case (A) and (C),
pretty different (and, perhapse, inverse) quantities are called "resolution".
This confusion sould be mentioned at the preamble of article resolution.
then, for each meaning, the definition should be provided.
Then, different quantities called "resolution" should be related with mathematical expressions,
for example, 
  
 {\rm resoluiton}_{\rm A} = \frac{1}{  {\rm resoluiton}_{\rm C} }
 
Then, if one needs to increase the resolution (example B above), 
then, perhaps, one means the resoluitonA
and an adverticement of some high-resoluiton optics may mean the 
resoluitonC.
Without such a specification, the term "resolution" has no more meaning than a 
~\sqrt{\rm generocity}~ or 
~\log({\rm stupidity})~.
(Similar problem takes place with som eother terms, for example, 
Einstein coefficients; not only value, but even dimension of these coefficients
depends on the system of notations.)
Either we should declare one of meanings as true, and other as wrong,
or to insist that this term has not yet established meaning, and therefore
any use of term resolution is possible only after the  definition within the same source. 
dima 03:15, 1 February 2007 (UTC)
thread_title:  article is confusive 

message: Link problem--at least when I checked--at http://fred.dsimprove.be/__offSite/pixel/ (see "Pixel & Resolution Tables").
--C-U RPCV 15:40, 5 April 2007 (UTC)
thread_title: Bad Link

message: I removed Landen99's image with comment Horrible gross ugly too-big image.  He put it back with Image was put in thumb form. Image is high quality work which illustrates this section very well and intuitively.  But more importantly, he replaced it with a white-background version instead of the horrible gross ugly gray-background one that had no usable luminance contrast, which took care of at least of a few of my negative characterizations.  While I still can't agree that it's high quality work, or particularly useful, it's at least more nearly tolerable, so I'll leave it for others to comment on or decide on now. Dicklyon 06:05, 11 October 2007 (UTC)
replies: text: Besides totally sucking, the image still has the wrong aspect ratio by a wide margin.  And it's not really the most appropriate content for the topic of this article, which is trying to say that image resolution is not just a pixel count. Dicklyon 00:26, 26 October 2007 (UTC)
thread_title: Yukky image

message: A discussion concerning the issue of comparing analog and digital resolutions and comparing non-square pixel resolutions with others and square-pixel resolutions has been started here as part of the Broadcast Engineering and Technology Taskforce of WikiProject Television.  Please discuss these issues there so that as a community we can come to a consensus.  --tonsofpcs (Talk) 18:04, 16 July 2008 (UTC)
thread_title:  Resolutions, comparisons, and non-square pixels 

message: Re: "720×480 (520 lines)"; how do you fit 520 lines into 480 pixels?
75.84.238.18 (talk) 11:23, 30 July 2009 (UTC)
thread_title:  520 > 480 

message: This section had the following statement:
"Sequences from newer films are scanned at 2,000, 4,000 or even 8,000 columns (line measured the other directions),(...)"
The statement in parenthesis makes no sense whatsoever. I'm not going to attempt to guess what the author meant, and neither are the readers. It starts off bad, "line measured," and gets uglier, "other directions." What other directions? I removed it.  —Preceding unsigned comment added by DrSlony (talk • contribs) 13:49, 9 January 2010 (UTC)
thread_title:  Lines: Resolution in various media - film 

message: There is some very bad info in this article.  For instance: 
* 35 mm original camera negative motion picture film can resolve up to 6,000 lines.
Where on earth did this figure come from?  35mm still images (~36mm x ~24mm) on average resolve around 2000 lines on the short side with color negative film.  Motion picture formats are 24mm on the LONG side!  There is no way that motion picture images on 35mm stock can resolve 6000 lines.  There exists no lens that will put that down to an image size 24mm on the long side, let alone film that will resolve that.  Check here http://www.normankoren.com/Tutorials/MTF1A.html for some stats on common films.  According to these stats TMAX 100, (which is one of the highest res/finest grain films in current use) resolves around 125 lp/mm, so on a 35mm still image 24mm high that's 3000 lines, which is quite impressive.  Panavision anamorphic is a little more than 17mm high, which gives us the potential of 2125 lines--hardly close to the 6000 stated in this wiki.
According to Arri, they've measured color film at 80 lp/mm: http://www.arri.de/fileadmin/media/arri.com/downloads/Camera/Tutorials/SystemsTechnologyBrochure.pdf which would give us a scant 1360 lines on anamorphic!
Scariest spec I can find is for the current Kodak 500T, around 25 lp/mm: http://motion.kodak.com/motion/uploadedFiles/TI2647.pdf ...which would give around 425 lines!
One better, Super 35 3-perf (popular these days) is only 13mm on the short side, which would give us only 325 lines if Kodak's specs are to be believed.
Films are scanned at up to 6k today for preservation, but this level of scanning resolves grains/dye packets which are beyond what could accurately be defined at "detail".  This is done to minimize the appearance of the grain due to the aliasing it can cause, not because of the level of detail contained in the original negative.  Higher resolution scans are later down sampled for archiving.  That may be where the 6000 lines number comes from.  But even then, that's 6000 columns, not lines, and a frame of which would have around 2500 lines/pixels of height at 2.39:1 aspect ratio.
I suspect 60-100 lp/mm is the most reasonable range for film resolution, with the low end representing common color film stock shot today, based on both academic research and personal experience.  2000 lines is a reasonable number to claim for negative film in anamorphic format and 1300 lines for Super 35.  6000 is unsupported and unless anybody has a source to backup that claim, I will edit the article appropriately.  Probably by just removing the claim altogether.  Micahmedia (talk) 10:13, 5 January 2011 (UTC)
replies: text: Rereading that Arri article, I see they measured 80 lp/mm at MTF25, not MTF50 which is the more accepted standard.  At MTF50, the Kodak film tested 33 lp/mm.  The pattern here is that figure of 6000 lines is way off.  Micahmedia (talk) 11:29, 5 January 2011 (UTC)
replies: text: Correction: I don't know what I was thinking--MTF50 is used for lenses, not capture media.  However, the images show that 80 lp/mm is only just barely resolved.  Micahmedia (talk) 11:37, 5 January 2011 (UTC)
thread_title: Film Resolution

message: "The measure of how closely lines can be resolved in an image is called spatial resolution"
"The spatial resolution of computer monitors is generally 72 to 100 lines per inch, corresponding to pixel resolutions of 72 to 100 ppi."
There is a fundamental error of interpretation here.  To achieve spatial resolution, the system must see the gap between lines as well as the lines themselves.  To resolve 72 lines per inch, the system must display 72 black lines and 72 intervening white lines.  Thus to achieve a spatial resolution of 72 lines, 144 pixels are required. Seeing 72 black lines with 72 pixels means seeing solid black, so in other words, 72 lines are not resolved.96.54.42.226 (talk) 00:48, 13 October 2012 (UTC)
replies: text: What above comment is talking about seems to be signal theory, where you would require a measurement of at least twice the "resolution" (i.e. frequency, or spatial resolution) as the signal to be able to measure the signal; which, at least for common monitor terminology, is not applicable. In monitors, the pixels/lines per inch value actually comes from the simple formula "(width in pixels) / (monitor width in inch)" or "(height in pixels) / (monitor height in inch)" (which usually both resolve to the same value due to LCD with quadratic pixels being used). When talking about an image (as in first quoted statement) signal theory would apply; however the "spatial resolution" as mentioned there would also not be measured in lpi/ppi. GustafJohansen (talk) 07:50, 30 May 2014 (UTC)
thread_title:  Pixel Resolution and Spatial resolution 

message: There is a part left out.  It has to do with the resolution of CCD and CMOS devices used in digital cameras today.  One has the following spec:
Resolution (TV Lines)350 TV lines
It would be nice to put some practical context to things like this. - KitchM (talk) 15:55, 25 August 2013 (UTC)
thread_title:  Lines Of Res - CMOS and CCD Digital Camera 

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thread_title:  External links modified 

message: "Image resolution" can refer to a number of different properties that I feel are distinct enough to describe in other pages, if not warrant their own.
"Image" obviously can refer to a photograph. It could also refer to any still graphic, maybe rectangular, maybe not. It could be used to refer to non-raster images, or vector graphics (which are not necessarily the same).
And then "resolution" can be discussed in several different contexts, most commonly (in my opinion) the pixel dimension, or count, along width and height. The resolution of each pixel can be specified, as a measure of how many different values (color, luminance, or a combination of components) it can represent. And it can also refer to a temporal resolution to some extent even while staying within the bounds of a still image, if it has been compressed into a representation of composed frequency-domain functions.
That's just for simple, visible spectrum, still graphics "images." The combinations would be too many to list if others were considered as well. (Motion picture and video is also referred to using the term "image" for the visual aspect, and if "imaging" is included, it does not necessarily have to be visual.)
kumowoon1025 (talk) 01:33, 19 April 2020 (UTC)
thread_title:  Term too vague – perhaps a conversion to a disambiguation is warranted