调整图像大小 [英] Go Resizing Images

问题描述

我在这里使用Go调整大小包: https://github.com/nfnt/resize

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

1. 我正在从S3中提取图像，例如:

1. I am pulling an Image from S3, as such:

image_data, err := mybucket.Get(key)
// this gives me data []byte

在那之后，我需要调整图像的大小:

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

将图像上传到我的S3存储桶

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

如何将数据[]byte转换为---> image.Image并返回到---->数据[]byte?

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

推荐答案

阅读 http://golang.org/pkg/image

// you need the image package, and a format package for encoding/decoding
import (
    "bytes"
    "image"
    "image/jpeg" // if you don't need to use jpeg.Encode, use this line instead 
    // _ "image/jpeg"

    "github.com/nfnt/resize"

    
)

// 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

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