![]() So, what this technique leaves us is a clear version of image C with slight gaps where pixel data from the two images would be equal (again, if any). Since we don't have a definitive record of what image C had in each pixel before being combined with image A we cannot determine which pixels had the same content in both image A and C (if any). In the Layers panel, right click on top layer > Edit Layer Attributes.In the Layers panel, select the layer containing the second image.the image A (without the image C overlay) the combined image B (this should appear as a single layer) A need to construct a clean copy of image C (perhaps to turn the overlay on and off).Another image (B) that consists of the first image (A) overlaid with a third image (C) that you do not have a separate file for.I know this is an old question, but just in case anyone else needs a relatively simple answer. On transparent parts of background image, blending C on the top of A Note: This method works as described if background image is opaque. (You could also choose Mode "Difference" for layer B, in suchĬase you should get absolutely black image.) Toggle layer B visibility to be sure that images look the same. But if you hide layer A, you'd see that layer C Now select layer C and start painting from the top left and coverĪll the image without lifting the brush.Select a place from which to clone and remember its position Select A layer and CTRL + on top left pixel to.Size: make brush larger to easily paint all the image at once. On "Tool options" pane set following options:īrush: use sharp round brush ("Hardness 100") Put images A and B as layers (A below B).In details creation of image C is the following: In this case it is possible to take color from pixels of background image A and apply it to corresponding pixels of result image B. Same effect, applied to selected region or whole image can be achieved using "Color to Alpha" action.īrush mode could also be applied to "Clone tool". Applying this brush, colored with color X, to definite pixel P1 creates a pixel P2 with lowered alpha channel, the way that blending P2 with pixel with color X in normal mode results pixel P1. GIMP has a brush mode named "Color erasing". Of course, no magic happens, and the partially transparent top layer won't alter colors or reduce transparency of the bottom layer, so it's only for cases of extension, where the altered pixels of the top layer cover the bottom layer. Now you have the diff, just Paste (Ctrl+V) it and create a new layer from it.Ensure that the top layer is selected and Copy (Ctrl+C) from it.Alpha to Selection (in the context menu) on the pasted diff layer.Undo, Undo to return transparency to our layers.Ensure the newly generated diff layer is selected and continue: Now we have the difference layer with white background in places of partial transparency, but we need those pixels to be transparent, so we'll take the shape of the diff and copy the image of this shape from the original top layer. Filters - Animation - Optimize (Difference).The images will receive white background, but don't worry, we'll undo it later. Remove Alpha Channel on both layers (the action is in the context menu).Here is a workaround I've found for this case: The things get complicated only if you have partial transparency, because the filter removes it. Open the images as two layers, run Filters - Animation - Optimize (Difference), you should get the same resulting image that is now made of the bottom layer and a diff layer on top of it. Update I recently answered a similar question to this on Stackoverflow, where the OP wanted to perform the task programatically (Using Python + Python-imaging-library) - I've posted the full program on that question and it might be of help for anyone interested in this answer. Further operations on the layer mask (I recommend using Colors->curve) can adjust the opacity/transparency of the areas on layer C. There you are - make Layers A and B invisible, and you should be very close to what you want. Anchor the pasted contents on the layer's mask (layer->Anchor layer).With the mask selected, paste the contents copied in step 3 (edit->paste).On the Layers menu, add a layer mask to C (Layer->Mask->Add Layer Mask). ![]() ![]() Duplicate Layer B, change it's mode back to "Normal" (let's call this layer C).Edit->Copy visible, to get a copy of the calculated effect on B.However, won't match B's colors as you want Should see the image mostly black is the images are alike, with theĬolored areas marking the areas that are different. On the layer's dialog, mark B's layer mode as "difference".Open both images as layers, A on the bottom, B on top.You could use the "difference" layer mode to create a layer mask, and apply it to B like this: ![]()
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