img_gen_imageNewRGBA.go

import (
  "bytes"
  "image"
  "image/color"
  "image/draw"
  "image/jpeg"
  ...
)
 
buf := new(bytes.Buffer)
 
m := image.NewRGBA(image.Rect(0, 0, 16, 16))
clr := color.RGBA{B: 0, A: 0}
draw.Draw(m, m.Bounds(), image.NewUniform(clr), image.ZP, draw.Src)
jpeg.Encode(buffer, img, nil)
 
w.Header().Set("Content-Type", "image/jpeg")
w.Header().Set("Content-Length", strconv.Itoa(len(buffer.Bytes())))
w.Write(buf.Bytes())