image processing - gimp: histogram across multiple layers -

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gimp has neat feature, histogram (windows -> dockable dialogs -> histogram). problem looks @ individual layers. i've playing around blending layers visualize computational operations, , i'd gauge final result visually through histogram.

so far i've been generating histogram by merging layers , observing histogram merged layer, i'd see same histogram without merging layers - i.e., have histogram use data user seeing (as if layers merged), rather single layer.

any way this?

i found have histogram want on "visible" layer

you can make appears using clicking right on top layer want see (the top layer?) , , click "new visible"


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