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Better Perceptual CMYK -> RGB Conversions #4

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mattdesl opened this issue May 18, 2020 · 1 comment · May be fixed by #22
Open

Better Perceptual CMYK -> RGB Conversions #4

mattdesl opened this issue May 18, 2020 · 1 comment · May be fixed by #22
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enhancement New feature or request

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@mattdesl
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mattdesl commented May 18, 2020 •
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Hi there, first thanks for your efforts converting this into a dataset. I have the book and its really beautiful, but as you mention in the Readme, it's hard to stay true to the CMYK printed colors when converting to screen. For example, "Corinthian Pink" (C:0 / M:35 / Y:15 / K:0) gets converted into #FFA6D9, but if you enter the same CMYK values into Photoshop, you get something closer to #F8B5BA depending on your color profile settings.

See the comparison, the palette on the left is how it looks in Photoshop, and on the right is your conversion. If you compare with the physical book itself, the left color is a much closer match.

proof

It would be nice to have these converted to RGB in a more perceptual way. Instead of entering each into Photoshop (pretty tedious), you could run it through my Python script here:

https://gist.github.com/mattdesl/3f6c7e9acad68927b18c749e2e91c857

In this example I'm using the following settings (you can export these from Photoshop's Color Settings dialog).

RGB – "sRGB IEC61966-2.1.icc"
CMYK Profile – "U.S. Web Coated (SWOP) v2.icc"
@dblodorn dblodorn pinned this issue Jun 25, 2020
@dblodorn
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@mattdesl hey thanks for this - yes many of the colors are perceptually quite different - I paint - so i'm pretty sensitive to this.

Im using a javascript module to return the rgb / hex off of the cmyk values - really should just do this manually and hard code into the data set.

Thanks for flagging this, and providing the script!!

@dblodorn dblodorn added the enhancement New feature or request label Jun 25, 2020
awaer added a commit to awaer/sanzo-wada that referenced this issue Nov 21, 2021
@awaer
Update colors with better perceptual cmyk -> rgb conversions
f9538af 
Fixes dblodorn#4
@awaer awaer linked a pull request Nov 21, 2021 that will close this issue
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Update colors with better perceptual cmyk -> rgb conversions awaer/sanzo-wada
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@mattdesl @dblodorn