不确定您到底在寻找什么,而且我根本没有使用图像包......但只是按照示例代码并使用graphics-go包(它适用于我),我能够在至少。
package main
import (
"fmt"
"os"
"image/draw"
"image"
"image/jpeg"
"code.google.com/p/graphics-go/graphics"
)
func main() {
fImg1, _ := os.Open("arrow1.jpg")
defer fImg1.Close()
img1, _, _ := image.Decode(fImg1)
fImg2, _ := os.Open("arrow2.jpg")
defer fImg2.Close()
img2, _, _ := image.Decode(fImg2)
m := image.NewRGBA(image.Rect(0, 0, 800, 600))
draw.Draw(m, m.Bounds(), img1, image.Point{0,0}, draw.Src)
//draw.Draw(m, m.Bounds(), img2, image.Point{-200,-200}, draw.Src)
graphics.Rotate(m, img2, &graphics.RotateOptions{3.5})
toimg, _ := os.Create("new.jpg")
defer toimg.Close()
jpeg.Encode(toimg, m, &jpeg.Options{jpeg.DefaultQuality})
}