Add some options

image/encode.go

@@ -10,18 +10,19 @@ import (
 )
 
 // NewEncoder returns a new Encoder.
-func NewEncoder(w io.Writer) *Encoder {
-	return &Encoder{w}
+func NewEncoder(w io.Writer, quality int) *Encoder {
+	return &Encoder{w, quality}
 }
 
 // Encoder struct.
 type Encoder struct {
-	w io.Writer
+	w       io.Writer
+	quality int
 }
 
 // Encode encodes image to JPEG.
 func (e Encoder) Encode(img image.Image) error {
-	err := jpeg.Encode(e.w, img, &jpeg.Options{Quality: 75})
+	err := jpeg.Encode(e.w, img, &jpeg.Options{Quality: e.quality})
 	if err != nil {
 		return err
 	}