Generate a tracking pixel image

image.go

package main

import (
	"encoding/base64"
	"log"
	"os"
)

func main() {
	b64 := "R0lGODlhAQABAID/AP///wAAACwAAAAAAQABAAACAkQBADs="
	b, err := base64.StdEncoding.DecodeString(b64)
	if err != nil {
		log.Fatal(err)
	}
	f, err := os.Create("1x1.gif")
	if err != nil {
		log.Fatal(err)
	}
	if _, err := f.Write(b); err != nil {
		log.Fatal(err)
	}
	if err := f.Close(); err != nil {
		log.Fatal(err)
	}
}