无法将image.image转换为[] byte。问题点用虚线包裹。

image_data, err := mybucket.Get(key)

if err != nil {
    panic(err.Error())
}

// reset format of data []byte to image.Image

original_image, _, err := image.Decode(bytes.NewReader(image_data))

new_image := resize.Resize(160, 0, original_image, resize.Lanczos3)
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// reset format the image.Image to data []byte here
var send_S3 []byte
var byteWriter = bufio.NewWriter(send_S3)
- - - - - - - - - - - - - - - - - - - - - - - - - -
err = jpeg.Encode(byteWriter, new_image, nil)

new_path := key + "_sm"

err = mybucket.Put(new_path, send_S3, "image/jpg", "aclstring")

基本上，我需要new_image为[] byte格式，以便可以将其发送到我的S3存储桶。

谢谢您的帮助。