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Why should I use TIFFs for print work? Just wondering what they do... if theyre smaller.. more colors?
For print, images are used at much higher resolution than web images (600ppi or more, as compared to 72ppi...). If you used a lossy image format, the "blemishes" it caused in your images would be very apparent in your final print job... with a lossless format, you can have a very high resolution image that will print properly.
TIFF files are great for cross-platform compatibility. However, if you are sending TIFFS to a different computer platform, I don't recommend using compression techniques, because the compression algos are many times NOT cross-platform compatible.
Using the BMP format should work fine for you if you're just doing web work. Just make sure to convert everything to GIF or JPEG format before publishing.
Then, when I send something off for printing, I'll usually include single layer copies in TIFF, EPS and PDF (depending on the desired quality of the print output, I may leave out the PDF on some jobs), or a nice set of color separations.