I just finished doing this on Linux, using Gimp 2.10.30. The only thing I did differently was to flatten the image before step #13 (otherwise only the top layer is exported). In the export dialog, top dropdown, I chose the option "BC 1 / DXT1", left everything else with defaults. Finished following the pdf instructions, and it works in my game. Very nice to have a matching character portraits.
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The only thing I did differently was to flatten the image before step #13 (otherwise only the top layer is exported). In the export dialog, top dropdown, I chose the option "BC 1 / DXT1", left everything else with defaults. Finished following the pdf instructions, and it works in my game.
Very nice to have a matching character portraits.