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You can do this with layer masking. It's a commonly used technique in raster image editing software such as GIMP, Photoshop or Krita, etc. Basically you would set up two layers, one with your colour image on the bottom, and the black and white image on a layer on top. To add a layer mask to a layer in GIMP, click on the Layer Mask icon in the layers panel. ...


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One method, easier than the Measure tool which doesn't snap to paths or anchors, is to use the Line Tool \ instead. Enable Smart Guides, draw a line while holding down Shift to constrain it horizontally or vertically, and its width or height will show in the tool options along the top. Then Undo Ctrl+Z to remove it. Obviously this will only work for ...


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Generate a layer mask which contains all transparency info of the layer. When you add a layer mask you get an opportunity to initialize the mask with existing layer alpha (=all cumulated transparency data) An example: A layer with solid fill and a couple of strokes with the eraser. Layer > Mask > Add layer mask dialog is opened and option transfer the ...


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