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Is there an easy way to generate a list of CMYK color values that will appear identical to the human eye under 589nm light? (lemmy.world)

submitted 1 year ago by [email protected] to c/[email protected]

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I picked up a low pressure sodium lamp and am working on a Halloween demonstration. I’m hoping to make a display that appears one way under normal light, but looks totally different under the monochromatic 589nm sodium vapor light.

So basically, I’m looking to generate a color wheel where I pick a shade of gray and get a list of colors that would look that gray under sodium vapor light.

…I feel like there must be a Python library for thing or something…

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[–] [email protected] 1 points 1 year ago* (last edited 1 year ago)

Here's the Wikipedia section one general colour space, with a pretty diagram of chromaticity, and the one on CMYK colour conversion. What you want is the preimage of a CMYK colour projected into the entire perceptual space.

CMYK actually sounds kind of complicated to do this with, so yeah look for a pre-made function to convert CMYK to CIE 1931 in whatever "normal" light you have. I can help you find the preimage from that once you do.

Edit: Oh wait, this was a Halloween thing. Maybe for next year?