image creator

package main

import (
	"fmt"
	"image"
	"image/color"
	"image/gif"
	"image/jpeg"
	"image/png"
	"math/rand"
	"os"
	"strconv"

	"github.com/chai2010/webp"
	"golang.org/x/image/bmp"
	"golang.org/x/image/tiff"
)

func main() {
	args := os.Args
	if len(args) < 4 {
		fmt.Println("Usage: image-creator <width> <height> <format>")
		return
	}
	width, _ := strconv.ParseInt(args[1], 10, 32)
	height, _ := strconv.ParseInt(args[2], 10, 32)
	format := args[3]
	myimage := image.NewRGBA(image.Rectangle{image.Point{0, 0}, image.Point{int(width), int(height)}})

	// This loop just fills the image with random data
	for x := 0; x < int(width); x++ {
		for y := 0; y < int(height); y++ {
			c := color.RGBA{uint8(rand.Intn(255)), uint8(rand.Intn(255)), uint8(rand.Intn(255)), uint8(rand.Intn(255))}
			myimage.Set(x, y, c)
		}
	}
	switch format {
	case "png":
		genPNG(myimage, int(width), int(height))
	case "jpeg":
		genJPEG(myimage, int(width), int(height))
	case "gif":
		genGIF(myimage, int(width), int(height))
	case "tiff":
		genTIFF(myimage, int(width), int(height))
	case "webp":
		genWEBP(myimage, int(width), int(height))
	case "bmp":
		genBMP(myimage, int(width), int(height))
	}

}

func genPNG(myimage image.Image, width, height int) {
	mypngfile, _ := os.Create("test.png")
	png.Encode(mypngfile, myimage)
	fmt.Printf("Generated image test.png of size %dx%d\n", width, height)
}

func genJPEG(myimage image.Image, width, height int) {
	myjpegfile, _ := os.Create("test.jpeg")
	jpeg.Encode(myjpegfile, myimage, nil)
	fmt.Printf("Generated image test.jpeg of size %dx%d\n", width, height)

}

func genGIF(myimage image.Image, width, height int) {
	mygiffile, _ := os.Create("test.gif")
	gif.Encode(mygiffile, myimage, nil)
	fmt.Printf("Generated image test.gif of size %dx%d\n", width, height)
}

func genTIFF(myimage image.Image, width, height int) {
	mytifffile, _ := os.Create("test.tiff")
	tiff.Encode(mytifffile, myimage, nil)
	fmt.Printf("Generated image test.tiff of size %dx%d\n", width, height)

}

func genWEBP(myimage image.Image, width, height int) {
	mywebpfile, _ := os.Create("test.webp")
	webp.Encode(mywebpfile, myimage, nil)
	fmt.Printf("Generated image test.webp of size %dx%d\n", width, height)

}
func genBMP(myimage image.Image, width, height int) {
	mybmpfile, _ := os.Create("test.bmp")
	bmp.Encode(mybmpfile, myimage)
	fmt.Printf("Generated image test.bmp of size %dx%d\n", width, height)

}