package main

import (
	"image"
	_ "image/gif"
	_ "image/jpeg"
	"image/png"
	"log"
	"os"
)

func readImage(path string) (img image.Image) {
	reader, err := os.Open(path)
	if err != nil {
		log.Fatal(err)
	}
	img, _, err2 := image.Decode(reader)
	if err2 != nil {
		log.Fatal(err2)
	}
	return img
}

func writeImage(path string, img image.Image) {
	f, err := os.Create(path)
	if err != nil {
		log.Fatal(err)
	}
	if err := png.Encode(f, img); err != nil {
		f.Close()
		log.Fatal(err)
	}
}