Does someone know a small image tool (or a web tool) that is capable of merging a .tga containing the RGB channels and a .tga containing the A channel into a single .tga?

Found a way of doing this in Gimp: https://graphicdesign.stackexchange.com/a/8943

No idea for Irfanview or Paint.NET

Just in case you need something special again: With the single file header for images, you can probably write that in a few minutes:

https://github.com/nothings/stb

29 minutes ago, Krypt0n said:

Just in case you need something special again: With the single file header for images, you can probably write that in a few minutes:

https://github.com/nothings/stb

If speed doesn't matter, I prefer using OpenCV/Numpy since it will basically be less than 10 lines of code. But an already existing tool would be faster