code: func Thumbnail(img image.Image, width, height int, filter ResampleFilter) *image.NRGBA {
  	return Fill(img, width, height, Center, filter)
  }
docs: // Thumbnail scales the image up or down using the specified resample filter, crops it
  // to the specified width and hight and returns the transformed image.
  //
  // Example:
  //
  //	dstImage := imaging.Thumbnail(srcImage, 100, 100, imaging.Lanczos)
  //