I can’t say that I found any set of instructions worked for me. I was using Gimp on Windows, and ImageMagick and had many false starts before finally finding a combination of steps for getting it just right.
Create a folder (any name you want) in your JSGME mods folder, this folder should include the structure of: Data(Your add-on Theater i.e Add-On Balkans)\Terrdata\objects\KoreaObj.
Put the files in this MOD KoreaObj folder into the KoreaObj folder you just created.
<p>@Tiger-0 Thanks for reporting. Something must have gotten wrong, as it was the very first things I did (see changelog 1.1). I’ll definitely have a look. <br />There’s gonna be one more update which will close the development for this skin.</p>