Hello Joshua,
Your plugin works fine now.
Yes, in fact, I need to print monochrome images (1bit).
I don't know what's going on with the palette. These are images sent to me and I've to change them to monochrome.
I do this while saving the files from FastStone in the Advanced window.
This was the easiest way to be sure the file was monochrome.
Maybe there's a best way to do but with your help, I manage to reach my goal.
Thank you very much for your very kind support.
PS : How was the hour without power? It may be fun