How to rotate an image?

External Google graphics package used to rotate the image.

Example

package main

import (    
    "os"
    "math"	
    "image"
    "image/jpeg"
    "code.google.com/p/graphics-go/graphics"
)

func main() {
    imagePath, _ := os.Open("jellyfish.jpg")
    defer imagePath.Close()
    srcImage, _, _ := image.Decode(imagePath)

	srcDim := srcImage.Bounds()
	dstImage := image.NewRGBA(image.Rect(0, 0, srcDim.Dy(), srcDim.Dx()))
	graphics.Rotate(dstImage, srcImage, &graphics.RotateOptions{math.Pi / 2.0})
	
	newImage, _ := os.Create("newjellyfish.jpg")
    defer newImage.Close()
    jpeg.Encode(newImage, dstImage, &jpeg.Options{jpeg.DefaultQuality})

}

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How to rotate an image?

Example

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