Jpegs are a "lossy" format. You will indeed lose detail if you save to .jpg. It compresses images based upon value (lightness) rather than chroma (color or hue), and is far more suitable for photographs than for artwork. .Tifs and .bums and .pngs are among the many non-lossy formats which keep all the data you see in the image, and more information besides. If you have a work of art that has taken you hours or days to set up, why spoil it by saving the final image in a lossy format? The file size of a .jpg is smaller and thus an image will load faster (recommended for auction sites such as eBay). Many contest holders and stores also require .jpgs, despite the poorer quality of the images, so that viewers can quickly navigate through them. You can always convert from a .tif or .bum to a .jpg (losing data), but you can't convert from a .jpg to a higher quality image and restore the data which isn't there. BTW, when you save an image as a .jpg, most programs will ask what quality you desire, so you can get somewhat better images by picking a higher number. Anyway, even if you submit .jpgs to a gallery or store, you should strongly consider keeping non-lossy images on your own computer if you care about the quality of your work. Carolly