Hey gents,
I have been messing with the icon bitmaps, trying to use BFCs briefing icon templates to create NATO floating icons. However, my files saved in GIMP are not displaying correctly ingame. I have looked at existing icon mods. Black seems to be transparent in lieu of a real alpha channel. 32 bit bitmaps with a binary alpha channel result in only a black square shown in CMBS. My icons, saved as a 24 bit bitmap, show up but do not have any transparency. Now here comes the weird part: When I open in GIMP Ian Leslie's awesome CMRT icons that have working transparency and no alpha channel and save them as a 24 bit bitmap without any changes they have the same issue: The black parts around the round icon are not transparent.
What are the exact bitmap properties necessary for CM?