I think as time has gone on, I think it's ok that Decker doesn't dither color images built-in. It makes sense to have the Bill Atkinson algorithm for the black and white images. But I've been having fun using ImageMagick to tweak dithering to my liking. And there's many algorithms and methods. So I guess I'm saying there wouldn't necessarily be a best one-size-fits-all algorithm anyway, except maybe FloydSteinberg mapped to the 16 Macintosh colors. But even then, it's nice to have the tweakability of ImageMagick.