is it possible to disable black color in a custom palette?
Viewing post in PixaTool 1.55 Released !!! comments
I know this is five years late, but you can get around this limitation by "filling up" all of the other colors in the palette with the darkest color in yours. There are 192 color slots in total. I was able to open up a .pal file in a text editor and quickly copy/paste the entries, then load that customized palette into PixaTool. Seems to work.