Talk:Color space

message: This article is fairly technical.  I think the introduction should be expanded with a brief explanation of how color spaces are actually used by artists and graphic designers today, i.e. what problems they solve.  In particular, laypersons are now exposed to color space terminology via popular PC software such as Adobe Photoshop, and these readers are probably more interested in "What is it and how is it useful?" than "How was it developed?".  151.199.131.100 11:47, 15 July 2006 (UTC)
thread_title:  Usefulness 

message: "An implementation which uses 16 bits per component will result in exactly the same range of colors as the 8 bit version, but to a 256×256×256 ≈ 16.7 million times higher accuracy."
This is surely wrong. Is 16 bit/channel RGB 16 million times more accurate than 16 bit/channel greyscale, and is 16/channel bit CMYK 256 times more accurate than 16 bit RGB? No, surely not. On the other hand this replaced a section that said "twice as much" accuracy, and that's clearly wrong too.  (Analogy: if you double the number of decimal places you do much more than double the accuracy of a number).
It might be safest just to say "substantially higher accuracy". Thoughts? Notinasnaid 09:23, 4 Feb 2005 (UTC)
thread_title:  16-bit color channels: accuracy 

message: A color space is multi-dimensional. A RGB color can thus be seen as a 3D object: Red=X, Green=Y, Blue=Z.
It needs to be pointed out that RGB, LAB, YIQ and HSV can be seen as 3D objects. An illustration of a 3D view of a colors space would make the concept much easier to understand! --Kasper Hviid 12:14, 26 Feb 2005 (UTC)
replies: text: Here are two. I would be interesting in knowing how to model the other color spaces. -SharkD 08:09, 23 October 2006 (UTC)
thread_title:  3D 

message: I am unsure whether the article always uses "Color Model" as a word in itself, or whether its sometimes uses it as a synonymous for "Color Space".
In any case, the Color Model part needs to be stripped into a article on its own. However, I don't feel I have the knowledge to do this.
If I may quote from color management for photographers:
A color model is a method of grouping numeric values by a set of primaries. Most color models have three primary components (e.g., RGB, CMY, LCH, HSV, L*a*b*). Some application-specific color models use more components, for example, CMYK. Photoshop and other image editing applications work with multiple color models. Some scientific color models such as x,y,Y or L*a*b* encompass all of human vision and have a defined scale such that a particular color will always have the same set of values. It’s quite useful to be able to assign a numeric value to a color based upon how humans perceive colors. Other color models such as RGB or CMYK have no standard defined scale or reference. These color models are abstractions and cannot describe a specific color with out first defining the scale or reference. Having an RGB value such as R10/G30/B50 does not tell us how to reproduce that color; the values provided are simply a ratio of the primary components (in this case RGB) without a necessary scale. In this example we know there’s more blue than red, more green than red, but not as much green as blue. Without a scale to tell us the actual amounts we can’t reproduce this color. This is where a color space comes into play. A color space provides this additional and necessary information. 
Think for a minute about the term color space. The first word, color, is fairly obvious. Let’s look at the term space in context. I have three sets of numbers to define red, green, and blue (R10/G130/B50) but how red or green or blue are these values? What is the scale? It is possible to plot any three primary values in three dimensions by treating the primaries as coordinates in space. This creates a solid or volume that represents all possible colors in that color space. This is a color space! The color space exists within the larger universe of human vision. Each color space is in a different position relative to this universe. Thus the same RGB values in each color space will be in a different location. 
Going back to the chocolate chip cookie analogy, suppose a color model is a cookie recipe with only three ingredients. I give you this recipe, which simply calls for 1-flour, 8-butter and 2-chocolate chips. You don’t have enough information to make the cookies. However if I provide you the recipe with a specific scale—1 cup of flour, 8 tablespoons of butter, and 2 cups of chocolate chips—I’ve provided the necessary information, the scale, to make a dozen chocolate chip cookies. If I provide additional information such as the brand of chocolate chips, you can reproduce exactly the same cookies I made. I can give you the cookie recipe in the metric scale such as liters and grams and you can still makes the same cookies even though the numbers are different. A color space is a color model that has a known reference and scale, in this case primaries (the ingredients) and scale (specific quantities of these ingredients).
:I'm not sure if I agree with everything above, but it seems to contradict the third paragraph of the introduction. I don't believe that a bunch of color swatches constitutes a color space. An unsophisticated color model, yes, but color space, no. PAR 02:01, 16 July 2006 (UTC)
replies: text: I haven't looked into this in detail, but Wikipedia includes both RGB color space and RGB color model articles. Certainly, people do get confused between them. However, as color spaces often dervive from color models, this article at least needs to note that. It may say too much; there is no overall coordination between articles, so there is more repetition than is desirable. This can only be resolved by having an active coordinating project, not piecemeal. What seems to have happened in this article is that the author(s) of the opening paragraphs haven't followed the Wikipedia standard to define the term in the opening sentence, and have in fact decided to define a different term. Notinasnaid 09:09, 17 July 2006 (UTC)

text: It seems to me that the color space article spends most of its time talking about color models. and the color model article spends most of its time talking about color spaces. -SharkD 15:48, 26 October 2006 (UTC)
thread_title:  Let's remove Color Model 

message: The image for subtractive color mixing seems too dark. Is this intentional? Otherwise, we could just make a negative of the additive mixing image and use that instead. -SharkD 08:11, 23 October 2006 (UTC)
replies: text: I think that it is reflecting the reality of CMYK colors, which are nothing like the complements of RGB colors. Notinasnaid 10:42, 23 October 2006 (UTC)
replies: text: The other, side-by-side gradient image is a better comparison of the CMYK and RGB models. Having the color mixing images be from different palettes might be misleading. -SharkD 06:44, 27 October 2006 (UTC)
replies: text:  It's not a particularly good comparison, because many saturated (particularly dark) CMYK colors cannot be displayed on a computer display. --jacobolus (t) 06:49, 17 May 2007 (UTC)
thread_title: Image too dark

message: Why is there absolutele no mention of the ISCC-NBS color model?
--Metallurgist 00:41, 15 November 2006 (UTC)
thread_title:  ISCC-NBS 

message: From the article:
However, a color model with no associated mapping function to an absolute color space is a more or less arbitrary color system with little connection to the requirements of any given application.
Cone Contrast Space if defined by the change in response of the three cone types.  The origin of this space (0,0,0) is defined by the current state of adaptation of the three cone types, so it is certainly not absolute or arbitrary.  And it is the most useful space to use if you want to model the visual system.  Drichters 02:23, 23 February 2007 (UTC)
thread_title:  Cone Contrast Space 

message: I would just get rid of the list article and use this navigation template in all color space articles. It needs to be expanded, of course, but that's easy. I prefer navigation templates to "list of..." articles unless the meaning of each element in the list needs to be explained.--Adoniscik (talk) 04:07, 21 January 2008 (UTC)
replies: text: The point of the list page is that a lot of color spaces are used for specific purposes, and an index (with summary) is appropriate to allow readers the opportunity to select the space that best suits them. That said I fully agree that adding a navigation template as well is a good thing. Tletnes (talk) 20:03, 12 November 2008 (UTC)
thread_title:  Merge with [[List of color spaces and their uses]] 

message: The article mentions "pure colors" but doesn't give any information on what a pure colour is.  —Preceding unsigned comment added by 203.214.49.35 (talk) 08:08, 13 August 2009 (UTC)
thread_title:  pure colours? 

message: "For example, although several specific color spaces are based on the RGB model, there is no such thing as the RGB color space."
Ok, this sentence contradicts with Wikipedia itself!
http://en.wikipedia.org/wiki/RGB_color_space
Please, fix this guys.  — Preceding unsigned comment added by Comptrol (talk • contribs) 09:30, 30 June 2011 (UTC)
replies: text: The two words are usually used interchangeably in scientific literature, and I think the separation between them that Wikipedia uses (“color model” meaning the idea / mathematical construction, “color space” meaning explicitly relatable to colorimetric data) is basically original research. For what it’s worth, “color space” is the only one of these with a formal technical definition (in the CIE’s international lighting vocabulary, the standard scientific source for such definitions). Unfortunately fixing the usage across Wikipedia is a somewhat substantial project. –jacobolus (t) 12:25, 1 July 2011 (UTC)
thread_title:  "There is no RGB color space" This is wrong according to Wikipedia! 

message: Section headers need improving. 188.223.18.19 (talk) 02:28, 13 March 2012 (UTC)
replies: text: Suggest away! –jacobolus (t) 03:45, 13 March 2012 (UTC)
replies: text: This is their idea of improvement. Δρ.Κ. λόγοςπράξις 03:49, 13 March 2012 (UTC)
thread_title:  Section headers 

message: Why does this article begin with a definition of 'color model'. It is not clear to me, a non-specialist, whether color model and color space can be used interchangeably, or if this is just poor article structure. I would have thought a page on color space should begin with an unambiguous definition of color space.
86.31.69.235 (talk) 09:55, 31 May 2012 (UTC)
thread_title:  model or space? 

message: Does the "Real Color Wheel" deserve mention in this article? See: http://www.realcolorwheel.com/colorwheel.htm
It seems to represent important work in defining an improved color space. Thanks! --Lbeaumont (talk) 14:10, 27 March 2014 (UTC)
replies: text: Looks interesting, maybe as an approach to defining a color model even if not a color space.  Even then, it's not in itself a reliable source  because it's self-published original/primary material.  (It's also a rambling essay with some bad science sprinkled in.)  Is there a reliable published secondary source that can establish its notability as a color model and explain the color model part of it in itself and how it's defined?  DavRosen (talk) 19:26, 27 March 2014 (UTC)
thread_title:  Real Color Wheel 

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thread_title:  External links modified 

message: I propose that the two articles Gamut and Color space be merged considering the amount of overlap in their content. RenZutↂ 11:05, 14 November 2017 (UTC)
replies: text: IMO Inconceivable to do that merger. IMO they are both important terms that should be covered and IMO fundamentally different.  Gamut is an attribute of color spaces and also of anything that produces color. IMO it inconceivable to not have an article on Color Space. That would be like eliminating the article on "Ocean" and merging it into the "Sea level" article because they have content in common. North8000 (talk) 04:20, 20 November 2017 (UTC)
replies: text: Considering that more than 50 percent of the content of those articles overlap, I think it is not justified to have separate articles at this point (may be later, yes if needed). Alternatives to this would be to remove all overlap and highlight the differences properly. However, highlighting the differences will hardly be enough to qualify for a separate article. So one may be included in the other. Merging will remove overlap as well as confusion with the other term, helping readers understand both the terms better.RenZutↂ 18:41, 22 November 2017 (UTC)
replies: text: Respectfully, you are not addressing the main point made, which in essence is that these are fundamentally different topics, even if they do have overlap in material.  North8000 (talk) 13:29, 23 November 2017 (UTC)

text: Oppose Gamut and color space are two completely separate concepts. Both are highly notable topics, and should be covered in different articles. A gamut is a set of colors, akin to a set of physical objects. Color spaces and color models are like geometric spaces and and associated coordinate systems used to quantify and measure colors and hence gamuts. It is fine to reduce the amount of overlap, but keep separate articles on separate concepts. --Mark viking (talk) 21:37, 22 November 2017 (UTC)
thread_title:  Merger proposal 

message: Hello all, I'am searching around but I'am unable to find any article for color scale, colors scales, color scales. This item is important for cartography, datavisualization, scientific graphs., etc. There are rainbow scales, heat map scale, sequential scales/gradiant scales/color ramp, diverging scales, qualitative color scales (see example on colorbrewer2.org by Cynthia Brewer). Cynthia and others have written academic article more or less on it while treating about semiotics and color theory. Rainbow scales are known to be BAD (source), etc. I'am checking up with you before to create the article : did any of you saw an article about color scales ? Yug (talk) 14:17, 12 May 2018 (UTC)
thread_title:  Color scales 

message: I just saw the notice put up to merge Draft:Color and mathematics into this.   There is some good writing and explanation at Draft:Color and mathematics and an excellent "see also" list,  and IMO it's not really a distinct topic.   So a merge might be a good idea. North8000 (talk) 17:45, 18 March 2019 (UTC)
thread_title:  Proposed merge from [[Draft:Color and mathematics]] 

message: This actually often creates some confusion (in code, and related technical documentations, discussions). They use "colorspace" to mean yuv2rgb matrices ("matrix coefficients")! While this article is somehow mainly about the "color primaries" concept in H.273! See ITU-T H.273. Hym3242 (talk) 03:33, 13 March 2024 (UTC)
thread_title:  We should note that this is not the "colorspace" sometimes used in code in projects like ffmpeg