Esempio n. 1
0
func procImage(fileName string) (string, error) {
	reader, err := os.Open(fileName)
	if err != nil {
		fmt.Errorf("Failed to open image with error: %s\n", err)
		return "", err
	}
	defer reader.Close()

	src, _, err := image.Decode(reader)
	if err != nil {
		fmt.Errorf("Failed to decode image with error: %s\n", err)
		return "", err
	}

	g := gift.New(
		gift.Invert(),
	)

	dst := image.NewRGBA(g.Bounds(src.Bounds()))
	g.Draw(dst, src)

	var opt jpeg.Options
	opt.Quality = 100

	fileName = fileName + "_processed.jpg"

	out, _ := os.Create(fileName)
	err = jpeg.Encode(out, dst, &opt)
	if err != nil {
		fmt.Errorf("Failed to encode image with error: %s\n", err)
		return "", err
	}

	return fileName, nil
}
Esempio n. 2
0
// take an image and revert its rgb channels (255-channel)
func invert(img image.Image) image.Image {

	g := gift.New(gift.Grayscale(),
		gift.Invert())
	dst := image.NewRGBA(g.Bounds(img.Bounds()))
	g.Draw(dst, img)

	return dst
}