package image
func (p *Gray) Set(x, y int, c color.Color)
Golang image.Gray.Set and SetGray functions usage example
package main
import (
"fmt"
"image"
"image/color" // for color.Alpha{a}
"image/png"
"os"
)
func init() {
// without this register .. At(), Bounds() functions will
// caused memory pointer error!!
image.RegisterFormat("png", "png", png.Decode, png.DecodeConfig)
}
func main() {
imgfile, err := os.Open("./img.png")
if err != nil {
fmt.Println("img.png file not found!")
os.Exit(1)
}
defer imgfile.Close()
img, _, err := image.Decode(imgfile)
bounds := img.Bounds()
canvas := image.NewGray(bounds) // for Gray
canvas.Set(100, 100, image.Transparent)
// http://golang.org/pkg/image/color/#Gray
// Gray represents an 8-bit grayscale color.
x := 512
y := 512
a := uint8(255)
canvas.SetGray(x, y, color.Gray{a})
}
References :
http://golang.org/pkg/image/#Gray.Set
http://golang.org/pkg/image/#Gray.SetGray
