Can I select something across multiple layers? - Printable Version +- Gimp-Forum.net (https://www.gimp-forum.net) +-- Forum: GIMP (https://www.gimp-forum.net/Forum-GIMP) +--- Forum: General questions (https://www.gimp-forum.net/Forum-General-questions) +--- Thread: Can I select something across multiple layers? (/Thread-Can-I-select-something-across-multiple-layers)

Can I select something across multiple layers? - Geocide - 09-28-2021 Hello, I am making a heightmap for the game Teardown, and I am new to complex editors like gimp entirely.  The port (the section with uniform color) and the ground above the port, shown as a brighter red, are on different layers. I need to select the area within the port, minus the area covered by lighter shades of red. If it's helpful, the reason I need to select this particular section is because I want to add a specific shade of blue on top of this section on a new layer. The preview isn't showing the image, so in case it doesn't work, I will also link the image below. Thanks for any help! RE: Can I select something across multiple layers? - Ofnuts - 09-28-2021 The selection mask (what everyone abusively calls the "selection") applies to the whole image, not to a specific layer. But it can be created/altred using data from one or more layers. In your case: Select (as in "making current") the port layer, and create a selection from it (say, fuzzy select) Select the ground layer, set the fuzzy select tool to Subtract mode (top row of red icons at the top of the tool options) and make a selection on it. This selection will be subtracted from the selection obtained in the previous step. There are other tricks to know, see: Painless use of selection tools RE: Can I select something across multiple layers? - rich2005 - 09-28-2021 @ Geocide You have set up nicely What you can do is Go to the port layer then Layer -> Transparency -> Alpha-to-Selection. That will select all the red block Go to the above port layer then Layer -> Transparency -> Subtract from Selection. Using that will keep any semi-transparency in the selection. You can check the effect with a fill: 30 second demo: https://i.imgur.com/iZlsUbM.mp4 RE: Can I select something across multiple layers? - Geocide - 09-28-2021 Thank you! Both of these suggestions worked