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Original post by BradSnobar >how do you create your own image format? Start with something like the bitmap format and modify it, and then get a good book on image formats like jpeg. If you want to make a really good image format, study up on the way optics works, (translation read up on a lot of physics). My advice is to stick with a standard though.

I agree with this. I save my work in psd then save to a bitmap and alter that bitmap outside of photoshop. Dds files seem to be the trend now a days. You can get a converter for dds at filefront. It is very handy if you're working with dds files. You can get this nice tool Here

Funny, I still use the TGA format. It was the easiest format that has the alpha channel and to be able to find a tutorial to load it. The rest might be better though. I only use TGA for the ease of use, not size or quality benefits.