Convert and Dither image to support 3 color epaper display

[rlightner]

I'm working with an epaper display that supports Black/White/(Red / Yellow) and would like to dither a full color image to just those 3 colors for display. I have no problems dithering to 2 colors (Black/White), but having some issues with this third color. Anyone done this or can point me in the right direction? Thanks!

[snibgo]

What version of IM, on what platform?

You can easily remap to any number of colours, with dithering. For example:

Code: Select all

magick xc:black xc:white xc:red +append +repage +write mpr:MAP +delete toes.png -remap mpr:MAP dith3.png

[rlightner]

I'll be using convert via a firebase function.

[snibgo]

I know nothing about firebase. You may need "convert" instead of "magick".

[rlightner]

Yup, I was able to use convert. Thank you very much for the assistance! I added -dither FloydSteinberg which cleaned up my test image as well.