8 hours ago
See my ofn-tiles and ofn-layer-tiles scripts, which create/save a big layer from/to individual tile files (ofn-tiles) or from/to multiple layers in the image (ofn-layer-tiles). Once you have the big layer, you can apply any kind of global color change (Curves or else) uniformly.
In a slightly more "manual "way, keep in mind that Gimp keeps your last settings around in most Color tools, so you can process images one by one,, and reuse the same settings on each image:
In a slightly more "manual "way, keep in mind that Gimp keeps your last settings around in most Color tools, so you can process images one by one,, and reuse the same settings on each image: