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 (

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}

  myfile, _ := os.Create("test.png")

  png.Encode(myfile, myimage)