Okay, you NUMEROUS fans of #ATS, I have done the next step in that set of #RosettaCode tasks dealing with #pixmaps (#bitmaps):

https://rosettacode.org/wiki/Bitmap/Write_a_PPM_file#ATS

You have to get new versions of the earlier files, if you looked at those before. There is a link to them at the top of this entry.

#ATSlang