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Converting RGB values to percentages (lemmy.world)

submitted 2 months ago by 5teverin0@lemmy.world to c/graphic_design@lemmy.world

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I ran across a table of settings for Photoshop's channel mixer for simulating various analog film stocks. However, the RGB color values are given as numbers in the 0-255 range, and channel mixer uses percentages. Any idea how to convert the RGB values to plug them into channel mixer?

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[–] over_clox@lemmy.world 3 points 2 months ago (1 children)

If I'm understanding you correctly, I'll use the variables C for Channel (R, G, or B), and P for Percentage...

P = C / 2.55

C = P * 2.55

[–] Ephera@lemmy.ml 1 points 2 months ago

Yeah, assuming it's a linear percentage, this should be basic rule of three. So, divide by 255, then multiply by 100.
Dividing by 2.55 is just doing that in one step...

[–] Nawor3565@lemmy.blahaj.zone 1 points 2 months ago

Divide the RGB values by 255? That will give you a number between 0 and 1, so just multiply that by 100 to get the percentage. Unless I'm misunderstanding what exactly you need to input into Photoshop.

[–] owatnext@lemmy.world 0 points 2 months ago

Like, CMYK?