When it comes to computer graphics, I almost always save to PNG and use JPEG for photos. For this pack, I converted the PNG's to JPG to lighten the download size and downloading time. The folder size went from 11.5, to 2.5 MB's. Pretty amazing, but that's compression for ya'.
As far as I know, Windows uses an antiquated, crappy format (BMP) for desktop wallpapers so I guess it doesn't really matter much what format I save to.
However, and despite the above, the single Eye of Ra wallpapers that I've uploaded are in PNG format. Sizes in the Pack
-------------------------------------- Single 1600x1200 here 3200x1200 here
If you're not Eye of Ra'd out yet, check out the Eye of Ra Firefox Persona
(link leads to the Firefox Add-ons site).
And,Eye of Ra Thong or Boxer Shorts
Hieroglyphic brushes from-
This is a reworked version of my original Eye of Ra
created in 2007. I didn't care for the glossy look as well as a few other things. This newer version is smother and toned down a bit.