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ungroup outline from background image in same layer

Category: Questionsungroup outline from background image in same layer
Brandon asked 3 months ago

Okay, I\’m brand new to the software. I was tracing over an image of my niece and nephew, thinking I was drawing in a new layer. After I spent an hour on it, I realized it was in the same layer. Is there away to remove the background image, or to select the outline to crop it?

Boudewijn Rempt Staff replied 3 months ago

That’s tricky. It might be possible to setup the difference between your image with lineart and the image without: logically the pixels that are different is your lineart. I’m not really sure how to do that myself, though…

1 Answers
Wolthera van Hövell Staff answered 3 months ago

Yes, what @Boudewijn Rempt  says is possible. I’m attaching a screenshot with examples of the steps:

  1. Overlay an your modified image with a copy of the original. You can get the original via layer → import → import layer…
  2. Set that top layer to the difference blending mode(instead of normal). This can be found under the negative category in the dropdown.
  3. Merge the two layers, then apply filter → color → color to alpha and ensure the color being removed is black.
  4. Finally, lock the alpha of the layer (the checkerbox icon in the layer docker), select black as foreground color and then go to edit → fill with foreground layer. The lines should be black now. Unlock the alpha to continue editing the layer.

Afterwards, you’ll proly want to import the original image again with import layer and then put it underneath the lines in the layerstack.