Golang streaming image manipulation

I am using go's standard library to re-encode user-supplied images to a standard format:

import (
    "io"
    "image"
    "image/jpeg"
)

func (imgReader io.Reader, imgWriter io.Writer) error {
    decodedImg, _, err := image.Decode(imgReader)
    if err != nil {
        return errors.Wrap(err, "error decoding image")
    }

    // whole image is currently in memory here as `decodedImg`

    if err := jpeg.Encode(imgWriter, decodedImg, &jpeg.Options{Quality: 90}); err != nil {
        return errors.Wrap(err, "failed to encode jpeg")
    }
    
    return nil
}

It bothers me that the entire image must seemingly be loaded into memory before I can encode and begin uploading it. I wish image.Decode() would give me a way to stream the parts of the image that have been downloaded into the encoder so that I could begin encoding and uploading the image before all of it is fully pulled into memory. Is this kind of streaming decode/encode possible, or is it the nature of image encoding that I need a fully decoded image before jpeg encoding will work? If I can stream it, hopefully I can be less strict about imposing size restrictions on the incoming image.