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Using GIMP, how do I apply Threshold or Levels to an entire image, meaning all layers throughout the image?
As you can imagine, applying Threshold of a certain value to each layer of a 90-layer image is exceptionally tedious.
PLEASE NOTE: Threshold and Levels are NOT FILTERS, so "Filter All Layers..." would not have anything to do with this problem. I have looked there. I tried it. (Unless you know of some way of making Threshold et alii into a filter.)
Linked layers only applies to some basic transforms, like moving and rotating. So, linking layers will not help.
My image has 65 layers, and I basically gave up and am going through each one sequentially. It's helped to speed things up a little bit to add the Threshold tool to the toolbox:
Dialogs -> Tools -> Click the eye next to Threshold
Still at least 10 seconds per layer...