Creating a PNG image in golang
The following very simple example creates a PNG image file in golang. It first creates a Image structure and then populates this with random data.
A file is then creating using os.Create, this is used as a io.Writer to which golang’s PNG encoder in image/png writes the encoded PNG data via the png.Encode function.
package main
import (
"image"
"image/png"
"image/color"
"os"
"math/rand"
)
func main() {
myimage := image.NewRGBA(image.Rectangle{image.Point{0,0},image.Point{100,100}})
// This loop just fills the image with random data
for x := 0; x < 100; x++ {
for y := 0; y < 100; y++ {
c := color.RGBA{uint8(rand.Intn(255)),uint8(rand.Intn(255)),uint8(rand.Intn(255)),255}
myimage.Set(x,y,c)
}
}
myfile, _ := os.Create("test.png")
png.Encode(myfile, myimage)
}
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