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rgb to hsl

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monolifed 2021-06-06 09:00:43 +03:00 committed by GitHub
parent 7e467b279f
commit e9687d763f
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1 changed files with 18 additions and 1 deletions
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colour.lua
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@ -108,7 +108,24 @@ function colour.hsl_to_rgb(h, s, l)
return r, g, b return r, g, b
end end
--todo: rgb to hsl --convert rgb to hsl
function colour.rgb_to_hsl(r, g, b)
local max, min = math.max(r, g, b), math.min(r, g, b)
if max == min then return 0, 0, min end
local l, d = max + min, max - min
local s, h = d / (l > 1 and (2 - l) or l)
l = l / 2
if max == r then
h = (g - b) / d
if g < b then h = h + 6 end
elseif max == g then
h = (b - r) / d + 2
else
h = (r - g) / d + 4
end
return h / 6, s, l
end
--todo: hsv, other colour spaces --todo: hsv, other colour spaces
--todo: oklab https://bottosson.github.io/posts/oklab/ --todo: oklab https://bottosson.github.io/posts/oklab/