gimp doesn't even support cmyk (which is only needed for print) properly so i doubt it's the default.

some versions of photoshop had bugs in the export plugins. for example photoshop7 had a buggy tga plugin. at the adobe website it was possible to download a fix.

i also find photoshop too expensive. especially in europe where it did cost more than 1200€ last time i checked. the older oem versions you can find on ebay are a bit dubious.