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I've scanned some book pages and imported them as layers to a single grey scale Gimp image. I need to do some identical Levels adjustments (primarily to correct white point) to each layer prior to exporting each layer as separate image using "Export layers" plugin.

Is there a way to adjust Levels info in bulk i.e. without having to do this adjustment per each layer separately?

For instance, if I'd wish to specify the white point for each layer to the value of 241, how would I manage to do that in one go or would I?

I am familiar with Layer Groups and available Layer options of G'MIC filter set, but to my knowledge these methods/plugins are not currently offering per layer color level batch operations. Do correct me if I'm wrong.

I typically do this with Imagemacik mogrify -level option via command line before importing the images as layers to Gimp, but on occasions I find I'd like to achieve this directly from within Gimp.

Specs: Windows 10 / Gimp 2.8.20

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