func blur(img image.Image, howmuch float32) image.Image {
g := gift.New(gift.Grayscale())
g.Add(gift.GaussianBlur(howmuch))
dst := image.NewRGBA(g.Bounds(img.Bounds()))
g.Draw(dst, img)
return (dst)
}
func doit(fn string) (string, error) {
file, err := os.Open(fn)
if err != nil {
return "", err
}
defer file.Close()
img, _, err := image.Decode(file)
if err != nil {
return "", err
}
b := img.Bounds()
var g *gift.GIFT
if b.Max.X-b.Min.X >= resizeThreshold || b.Max.Y-b.Min.Y >= resizeThreshold {
g = gift.New(
gift.Resize(resizeSize, resizeSize, gift.LanczosResampling),
gift.GaussianBlur(sigma))
} else {
g = gift.New(gift.GaussianBlur(sigma))
}
dst := image.NewRGBA(g.Bounds(img.Bounds()))
g.Draw(dst, img)
img = dst
fn = path.Base(fn)
ext := path.Ext(fn)
fn = fmt.Sprintf("./%s.blur%s", fn[:len(fn)-len(ext)], ext)
w, _ := os.Create(fn)
defer w.Close()
if err = jpeg.Encode(w, dst, nil); err != nil {
return "", err
}
return fn, nil
}