I am a new user to using G’MIC and am looking for help on using CLI for the gcd_auto_balance for many images. I just manually used the G’MIC-QT plugin for GIMP and made changes but have several hundred more that I would love to use the CLI for the filter and passing parameters with input and output. I cannot find anything on parameters for the filter.
I suggest you read this post : How To Run A GMIC Filter On Hundreds Or Thousands Of Layers • GIMP Chat
They do exacly that to process multiple frames of an animation.