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stegoTest2.go
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stegoTest2.go
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// https://www.socketloop.com/tutorials/golang-get-rgba-values-of-each-image-pixel
// https://stackoverflow.com/questions/33186783/get-a-pixel-array-from-from-golang-image-image
// https://socketloop.com/tutorials/golang-convert-integer-to-binary-octal-hexadecimal-and-back-to-integer
// https://dev.to/andyhaskell/how-i-made-a-slick-personal-logo-with-go-s-standard-library-29j9
package main
import (
"fmt"
"flag"
"image"
"image/color"
"image/png"
// ^ https://golang.org/pkg/image/
"os"
//"strconv"
//"io/ioutil"
)
func decodeImg(myImage string) image.Image {
file, err := os.Open(myImage)
if err != nil {
fmt.Println(err)
}
defer file.Close()
data, _, err := image.Decode(file)
if err != nil {
fmt.Println(err)
os.Exit(1)
}
return data
}
func recolor(data image.Image, bounds image.Rectangle) *image.RGBA {
//newColor := color.RGBA{R: 255, G: 255, B: 255, A: 255}
recolored := image.NewRGBA(bounds)
for y := bounds.Min.Y; y < bounds.Max.Y; y++ {
for x := bounds.Min.X; x < bounds.Max.X; x++ {
colors := data.At(x, y)
r, g, b, _ := colors.RGBA()
// Convert RGBA values to 8-bit
r = ((r / 257) * 2) % 255
g = ((g / 257) * 2) % 255
b = ((b / 257) * 2) % 255
//a = ((a / 257) * 2) % 255
//fmt.Printf("%v, %v, %v\n", r, g, b)
newColor := color.RGBA{R: uint8(r), G: uint8(g), B: uint8(b), A: 255}
recolored.Set(x, y, newColor)
}
}
return recolored
}
func main() {
var image string
var output string
flag.StringVar(&image, "f", "", "PNG File to use")
flag.StringVar(&output, "o", "", "Output file")
flag.Parse()
data := decodeImg(image)
bounds := data.Bounds()
//readPixels(bounds, data)
out, err := os.Create(output)
if err != nil {
fmt.Println(err)
}
defer out.Close()
recolored := recolor(data, bounds)
if err := png.Encode(out, recolored); err != nil {
fmt.Println(err)
}
}