png2bin.go

package main

import (
	"bytes"
	"encoding/binary"
	"fmt"
	"image/png"
	"os"
)

func main() {
	filePng, err := os.Open(os.Args[1])
	if err != nil {
		fmt.Println(err)
	}
	defer filePng.Close()
	img, err := png.Decode(filePng)
	if err != nil {
		fmt.Println(err)
		os.Exit(1)
	}
	fileBin, err := os.Create(os.Args[2])
	if err != nil {
		fmt.Println(err)
	}
	defer fileBin.Close()
	MaxX := img.Bounds().Max.X
	MaxY := img.Bounds().Max.Y
	fmt.Println(MaxX)
	fmt.Println(MaxY)

	var w bytes.Buffer

	for i := 0; i < MaxX; i++ {
		//fmt.Println(i)
		for j := 0; j < MaxY; j++ {
			gray, _, _, _ := img.At(i, j).RGBA()
			binary.Write(&w, binary.LittleEndian, int16(gray))
		}
	}
	w.WriteTo(fileBin)
}