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nxshock 2017-06-23 19:18:15 +05:00
parent b055be1d8e
commit 602c4b0993
6 changed files with 227 additions and 1 deletions
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comparators.go Normal file
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package colorcrop
import (
"image/color"
"math"
)
// comparator is a function that returns a difference between two colors in
// range 0.0..1.0.
type comparator func(color.Color, color.Color) float64
// CmpColorDifference returns difference of two colors
func CmpSquareRGBComponentsDiff(color1 color.Color, color2 color.Color) float64 {
const maxDiff = 113509.94967402637 // Difference between black and white colors
r1, g1, b1, _ := color1.RGBA()
r2, g2, b2, _ := color2.RGBA()
return math.Sqrt(math.Pow(float64(r2)-float64(r1), 2.0)+
math.Pow(float64(g2)-float64(g1), 2.0)+
math.Pow(float64(b2)-float64(b1), 2.0)) / maxDiff
}
// CmpColorDifference returns difference of two colors.
func CmpRGBComponentsDiff(color1 color.Color, color2 color.Color) float64 {
const maxDiff = 765 // Difference between black and white colors
r1, g1, b1, _ := color1.RGBA()
r2, g2, b2, _ := color2.RGBA()
return math.Sqrt(math.Abs(float64(r2)-float64(r1))+
math.Abs(float64(g2)-float64(g1))+
math.Abs(float64(b2)-float64(b1))) / maxDiff
}