func createChunk(mask, image *imagick.MagickWand, x, y int) error {
if err := mask.CompositeImage(image, imagick.COMPOSITE_OP_SRC_IN, -x, -y); err != nil {
return err
// fmt.Sprintf("Chunking for (%d;%d) failed: %v", x, y, err)
}
if err := mask.WriteImage("tmp/" + strconv.Itoa(x) + "_" + strconv.Itoa(y) + ".png"); err != nil {
return err
// fmt.Sprintf("Saving chunk for (%d;%d) failed: %v", x, y, err)
}
return nil
}