Go Resizing Images

I am using the Go resize package here: https://github.com/nfnt/resize

  1. I am pulling an Image from S3, as such:
image_data, err := mybucket.Get(key)
// this gives me data []byte
  1. After that, I need to resize the image:
new_image := resize.Resize(160, 0, original_image, resize.Lanczos3)
// problem is that the original_image has to be of type image.Image
  1. Upload the image to my S3 bucket
err : = mybucket.Put('newpath', new_image, 'image/jpg', 'aclstring')
// problem is that new image needs to be data []byte

How do I transform a data []byte to —> image.Image and back to ----> data []byte ?

Read http://golang.org/pkg/image

// you need the image package, and a format package for encoding/decoding
import (
    "bytes"
    "image"
    "image/jpeg"

    "github.com/nfnt/resize"

    // if you don't need to use jpeg.Encode, import like so:
    // _ "image/jpeg"
)

// Decoding gives you an Image.
// If you have an io.Reader already, you can give that to Decode 
// without reading it into a []byte.
image, _, err := image.Decode(bytes.NewReader(data))
// check err

newImage := resize.Resize(160, 0, original_image, resize.Lanczos3)

// Encode uses a Writer, use a Buffer if you need the raw []byte
err = jpeg.Encode(someWriter, newImage, nil)
// check err