Legacy ImageMagick Discussions Archive

Sorry, you'll have to expand on that. Say, "-random-threshold 0x100%" on a grayscale input gives me a monochrome dithered image. I can't see how I'd use this to get a 256-color image.

Okay, thanks again.

Thanks. magick in.tiff -attenuate 0.25 +noise Uniform -depth 8 out.tiff This was the effect I was looking for. Although, I'd be interested to know how much of a difference a proper dithering algorithm would theoretically make on something other than a basic gradient. Am I correct in thinking that it ...

Hello. I am having trouble understanding dithering. In short: I want to be able to do whatever it is Photoshop does when switching color depth (per channel) from 16-bit to 8-bit mode. The overall aim is to batch-convert normalmaps and heightmaps to an appropriate format. To keep it simple I'm trying ...