Package mogrify binds to libgd to perform transformations on
images. It supports GIF/JPEG/PNG images, which it can decode and
encode to. You can decode from a format and encode to another.
The current set of transformations is limited to cropping, resizing and resampling.
You will need libgd for the C bindings, then:
go get github.com/tobi/mogrify-go
jpg, err := mogrify.DecodeJpeg(file)
if err != nil { log.Fatalf(err) }
defer jpg.Destroy()
b := mogrify.Bounds{Width: 50, Height: 50}
resized, err := jpg.NewResized(b)
if err != nil { log.Fatalf(err) }
defer resized.Destroy()
_, _ := mogrify.EncodeGif(newfile, resized)
if err != nil { log.Fatalf(err) }