Even though I have done this sort of thing for G'MIC-QT as a cli command, I decided to make it as a plugin just out of doing something different. What this plugin does is modulo functions, but on the end of modulo expression, the value is added by 1. Essentially useful for gradient map preparation, and that's the main reason why this exist. It can also be used for glitch art.   Plugin Download - Image Modulo Toolkit.dll   After you install the plugin, it's under Adjustment