Golang image.gif.Encode function example

package image/gif

Golang image.gif.Encode function usage example

 package main

 import (
 "flag"
 "fmt"
 "image"
 "image/color"
 "image/draw"
 "image/gif"
 "math/rand"
 "os"
 "time"
 )

 func main() {
 flag.Parse()
 rand.Seed(time.Now().UTC().UnixNano())

 out, err := os.Create("./output.gif")
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 // generate some QR code look a like image

 imgRect := image.Rect(0, 0, 100, 100)
 img := image.NewGray(imgRect)
 draw.Draw(img, img.Bounds(), &image.Uniform{color.White}, image.ZP, draw.Src)
 for y := 0; y < 100; y += 10 {
 for x := 0; x < 100; x += 10 {
 fill := &image.Uniform{color.Black}
 if rand.Intn(10)%2 == 0 {
 fill = &image.Uniform{color.White}
 }
 draw.Draw(img, image.Rect(x, y, x+10, y+10), fill, image.ZP, draw.Src)
 }
 }

 var opt gif.Options

 opt.NumColors = 256 // you can add more parameters if you want

 // ok, write out the data into the new GIF file

 err = gif.Encode(out, img, &opt) // put num of colors to 256 <------- here
 if err != nil {
 fmt.Println(err)
 os.Exit(1)
 }

 fmt.Println("Generated image to output.gif \n")
 }

Reference :

http://golang.org/pkg/image/gif/#Encode

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