php Open tga and save tga

Question

I am trying to edit a TGA (32 bit). The goal is that I open the file, add some text and save it again as TGA (32 bit).

I managed to open a TGA file using some scripts, but it seems that I need imagick to save it also as a TGA. (but with imagick i can't open a TGA).

Does someone has an example of saving a tga file 32 bit? For opening I could also work from a .jpg file

Thanks

Wouter