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22 lines
460 B
Go
22 lines
460 B
Go
package caire
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import (
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"image"
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"image/color"
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)
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// Convert image to grayscale.
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func Grayscale(src *image.NRGBA) *image.NRGBA {
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dx, dy := src.Bounds().Max.X, src.Bounds().Max.Y
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dst := image.NewNRGBA(src.Bounds())
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for x := 0; x < dx; x++ {
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for y := 0; y < dy; y++ {
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r, g, b, _ := src.At(x, y).RGBA()
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lum := float32(r)*0.299 + float32(g)*0.587 + float32(b)*0.114
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pixel := color.Gray{uint8(lum / 256)}
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dst.Set(x, y, pixel)
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}
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}
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return dst
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}
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