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Hello. My goal is to submit a TIFF file with the highest quality possible to Nations Photo Lab for printing. The website for Nations Photo Lab says that the file submitted must have 8 bit color depth. I have read conflicting reports about the color depth of files exported from GIMP. My question is: as a GIMP user, what do I need to do in order to get a TIFF file of a picture with 8 bit color depth? Thank you.

Make sure the image is 8bit precision (Image > Precision). Export to TIFF and use on of the 4 top compressions methods (None, LZW, Deflate, PackbBits) that are lossless.

This said the difference between a 8bit TIFF and a good quality JPEG is minor...