GregW
Yoda

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There are things in Darktable that are more powerful and intuitive. Spot removal vs. Gimp or Photoshop's clone tool is a good example. With those two, you set your tool size from the menu, feather it, choose a sample, click on the spot and see how good you did. Good? Go to step 3. With Darktable, as soon as you move the pointer onto the image, the tool shows you the size as well as where the feather will end. Using the mouse scroll changes the tool size, cntrl>scroll changes the feather. Click on the bad spot and drag to an area you want to clone from. The beauty comes in if you don't like the results. You can reposition either point on the fly without having to undo anything, even if you've moved on to 10 other spot removals.GIMP is just easier for me to use for doing what little I want.