我有以下代碼。這確實(shí)將前景圖像（logo.jpg）粘貼在背景圖像（background.jpg）上，同時(shí)粘貼該前景圖像，我要設(shè)置該前景圖像的不透明度。我使用了DrawMask（http://golang.org/doc/articles/image_draw.html），但似乎這里缺少某些內(nèi)容。請(qǐng)參見(jiàn)下面的代碼。有人有主意嗎？package main    import (    "os"    "image/draw"    "image"    "image/jpeg")func main() {//Background image    fImg1, _ := os.Open("background.jpg")    defer fImg1.Close()    img1, _, _ := image.Decode(fImg1)//Logo to stick over background image    fImg2, _ := os.Open("logo.jpg")    defer fImg2.Close()    img2, _, _ := image.Decode(fImg2)//Mask image (that is just a solid light gray image of same size as logo)    fmask, _ := os.Open("mask.jpg")    defer fImg2.Close()    mask, _, _ := image.Decode(fmask)//Create a new blank image m    m := image.NewRGBA(image.Rect(0, 0, 1920, 1280))//Paste background image over m    draw.Draw(m, m.Bounds(), img1, image.Point{0,0}, draw.Src)//Now paste logo image over m using a mask (ref. http://golang.org/doc/articles/image_draw.html )//******Goal is to have opacity value 50 of logo image, when we paste it****    draw.DrawMask(m, m.Bounds(), img2, image.Point{-100,-100}, mask, image.Point{-100,-100}, draw.Src)     toimg, _ := os.Create("new.jpg")     defer toimg.Close()     jpeg.Encode(toimg, m, &jpeg.Options{jpeg.DefaultQuality})}上面的代碼由Sathish（http://stackoverflow.com/questions/12430874/image-manipulation-in-golang）幫助。謝謝Sathish。