Can all visible colors be represented on a single map in photoshop or other digital software?

Community Beginner ,
Jul 19, 2021 Jul 19, 2021

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I think it maybe could. here is my reason.

1.for example HSL color model, the S and L can be in one element : Lightness. (I guess, maybe it is wrong)

2. Lightness change from 0% to 100%, so S and L change from 0% to 100%

3. the H change from0 to 100%。

so, I think all visible colors can be represented on a single map.

but I am not sure about it , so I want to ask the Professional Help.

 

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Adobe Community Professional ,
Jul 19, 2021 Jul 19, 2021

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[Moderator moved from Using the Community (forums) to Photoshop.]

 

HSL = Hue, Saturation & Luminosity (brightness).

RGB = Red, Green & Blue.

RGBA = Red, Green, Blue & Alpha Transparency

CMYK = Cyan, Magenta, Yellow & Key (Key denotes black in print).

 

Color Converter Chart:

https://www.w3schools.com/colors/colors_converter.asp

 

Hope that helps.

 

Nancy O'Shea, Adobe Product User & Community Professional
Alt-Web Design & Publishing ~ Web : Print : Graphics : Media

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Adobe Community Professional ,
Jul 19, 2021 Jul 19, 2021

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I would doubt it, since digital images are quantized by nature, whereas the eye is continuously variable.

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Adobe Community Professional ,
Jul 19, 2021 Jul 19, 2021

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By “map,” are you looking for a diagram of the color range visible to the human eye, such as the diagram of the CIE 1931 color space?

 

If that’s the kind of “map” you’re looking for, you can interactively examine it and other color spaces in 3D, using software such as ColorThink Pro or Apple ColorSync Utility that comes with every Mac.

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Community Beginner ,
Jul 20, 2021 Jul 20, 2021

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the“MAP” means a 2D "plane". I just want to know: whether a 2D plane can Reproduce all visible colors in theory

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Adobe Community Professional ,
Jul 20, 2021 Jul 20, 2021

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Again, I say no. A digital image can only have discrete values. The human eye does not. Increasing the bit depth, or using floating point values will increase the precision, but the possible values will still be limited to retional numbers. The eye  could see a color "in between" the colors. Suppose you could se a color that would corespond to, say, 78 + π in the Green channel. The closest you could get digitally would be 81 or 82, not 81.1415926535897932384626433832795 . . .

 

 

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Adobe Community Professional ,
Jul 19, 2021 Jul 19, 2021

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Something like this you could probably recreate at large scale in Photoshop.

JainLemos_0-1626729591851.png

 

Color Perception (gsu.edu)

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Adobe Community Professional ,
Jul 20, 2021 Jul 20, 2021

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OSX’s ColorSync Utility will display 3D plots of different device color spaces—to represent a color space you would need a z axis as well as x,y. Adobe Photoshop CIELAB is used as a translation space for making conversions between device profiles, so Lab would be close to what you are looking for:

 

Screen Shot 4.png

 

Here is typical monitor display (sRGB) compared to Lab:

 

Screen Shot 5.png

 

And here is sRGB compared to typical print output (USWeb Coated SWOP). The spaces intersect—some colors can be printed but not displayed, and some colors can be displayed but not printed:

 

Screen Shot 6.png

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