.PNG is our standard. P.N.G stands for Portable Network Graphic. It's the native file format for popular programs such as Microsoft Office, and Adobe Fireworks. More importantly, it can support lossless compression, 48-bit, true-color depth, with varying levels of transparency. It's a perfect fit for us.
However, not all of our isolated stock art will have transparencies. The Artist may isolate the subject with lighting.
Be sure to look for files with a checkered background, which will include transparencies, and save you time and money!
.EPS is our standard. Encapsulated PostScript, or EPS, is a DSC-conforming PostScript document. It's the industry standard. We allow Artists to save their illustrations as .EPS V10 or lower, it means more tools and effects at the Artist's disposal (including transparencies). A big step in the right direction (or at least that's what we think).
If you don't need the file in vector format, you can buy the illustration as a .PNG offering YOU cheaper pricing. And who doesn't want to save a few bones? Read more about it here.