The conversion of different formats is easy as long as no alpha channel is involved.
After I wasted half a day trying to make my Photoshop Elements to support the TGA alpha channel (even with the PS 7.0 plugin), then XnView, then Irfanview and a few others, I finally gave up and decided to write an app myself. Powered by some libraries I've written for SkinStudio this turned to be much easier than making the existing tools to do it for me.
What it can do?
- convert from TGA/PNG/BMP with alpha channel to any other of the three formats (chosen from a list).
- convert files en masse or even whole folder structures.
- ignore or include files without an alpha channel.
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