Highest Quality Image Format

My apologies if this thread is in the wrong forum. I have a question that's been bugging me for a while now. What format, in your opinion, would be the best to save an image for the highest quality to be used in games? What pros and cons do the various image formats offer when it comes to size and quality?

When I was in school and taking some graphic arts classes. the format of choice was tiff. It was non-lossy and fairly portable. Im not sure what they use in games. And I dont know if what held true in 95-97 is still true today. EPS was also a good choice but we were using Adobe products and I can remember what all can open EPS files It too may have been multi platform/application friendly. Sorry I couldnt give any 'real' solid help just tossing some info (albeit dated) out there maybe someone more knowledgeable can come in and shed some light on this.

I'm looking for an application that will convert images to the TGA format. Apparently that's pretty good for games.

Photoshop does.

Also:

http://www.irfanview.com/

http://www.faststone.org/FSViewerDetail.htm

Paint Shop Pro will also convert to Truevision Targa (.tga) format .

http://www.corel.com/servlet/Satellite?pagename=Corel3/Products/Display&pid=1047025487586

Not sure what will come of Corel Buying Jasc, hope it only improves on a decent product.