Archiving Photo Images

I would use TIFF rather than JPEG because JPEG is a lossy format. It throws away data whenever you open it, do something, and save it again.
Only if, after opening, you re-save it as a JPEG, which will indeed lead to progressive degradation. But you don't lose any more data if you resave a JPEG as a TIFF or other lossless format. This is what publishers would do.
In fact, in prepress terms, maximum quality JPEG compression results in images which are indistinguishable from uncompressed files. In a survey of print professionals who were shown the printed results of various hi-res Photoshop images printed from uncompressed files and from max quality JPEGs of the same image, none could tell the difference. So JPEG compression is an extremely good choice when trying to get the maximum number of files on a CD-ROM, e.g. a photo archive.

Read more opinions here:
http://www.ekdahl.org/archiving_photo_images.htm

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