Hi Sally,
Try saving a jpeg as a Tiff.
I have just tried it and a 2.5mb jpeg becomes a 15.14 Tiff.
My thought is that if you are sending to Agencies they will want absolutely best image quality and that can only come from 16 bit Tiffs, and to get them you need to shoot in RAW then convert to 16 bit Tiff.
I have printed a jpeg which is 8 bits from my D100 on A2 without any obvious signs of jpeg blocks showing. A 16 bit file would have been far better though.
Don
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