Bug in displayable() in oklch

[VojtechVidra]

Hi @danburzo,

I found a funny bug in displayable function. It seems like most (if not all) of the oklch colors are displayable with lightness around 0.5-1 regardless of chroma and hue.

You can try this:

culori.displayable({l: 0.6, c: 0.17, h: 153, mode: "oklch"}) // => false
culori.displayable({l: 0.7, c: 0.17, h: 153, mode: "oklch"}) // => true
culori.displayable({l: 0.9, c: 0.17, h: 153, mode: "oklch"}) // => true
culori.displayable({l: 1, c: 0.17, h: 153, mode: "oklch"}) // => false

[danburzo]

Hi @VojtechVidra, here's a visualization of the Oklch color space with chroma 0.17, hue: 153: https://oklch.com/#66.2,0.17,153,100 For this chroma/hue combination, colors within the sRGB gamut (for which displayable returns true) correspond to the lightness range [0.66-0.9]. So at least the results for the four examples given are expected.

[VojtechVidra]

Sorry, my bad.. I'm fighting a bit with the fact that LCH lightness is [0, 100] and OKLCH lightness is [0, 1].

Thanks for the reply and sorry for bothering 🙂

[danburzo]

No worries, glad it's sorted!