go - Change color of a single pixel - Golang image

Question

I want to open jpeg image file, encode it, change some pixel colors, and then save it back as it was.

I'd like to do something like this

imgfile, err := os.Open("unchanged.jpeg")
defer imgfile.Close()
if err != nil {
    fmt.Println(err.Error())
}

img,err := jpeg.Decode(imgfile)
if err != nil {
    fmt.Println(err.Error())
}
img.Set(0, 0, color.RGBA{85, 165, 34, 1})
img.Set(1,0,....)

outFile, _ := os.Create("changed.jpeg")
defer outFile.Close()
jpeg.Encode(outFile, img, nil)

I just can't come up with a working solution, since default image type that I get after encoding image-file doesn't have Set method.

Can anyone explain how to do this? Thanks a lot.

Answer 1

Waitting for answers