29 lines
739 B
Go
29 lines
739 B
Go
package helper
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import "math"
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// Linearize converts an sRGB component in the range [0, 0xffff] to a linearRGB component in the range [0, 1].
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func Linearize(c uint32) float64 {
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l := float64(c) / 0xffff
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if l <= 0.039285714285714285714285714285714 {
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return l / 12.923210180787861094641554898407
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}
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return math.Pow((l+0.055)/1.055, 2.4)
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}
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// Delinearize converts a linearRGB component in the range [0, 1] to an sRGB component in the range [0, 0xffff].
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func Delinearize(l float64) uint32 {
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switch {
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case l <= 0:
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return 0
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case l <= 0.0030399346397784299969770436366690:
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return uint32(l*846922.57919793247683733430026710 + 0.5)
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case l >= 1:
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return 0xffff
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default:
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return uint32(69139.425*math.Pow(l, 1/2.4) - 3603.925)
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}
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}
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