CHG_CANON wrote:
The specific technical printing options are best determined directly from each unique candidate print vendor. For candidates you review, add
https://www.printique.com/ (formally AdoramaPix). Although they'll accept TIFF, they prefer JPEG in sRGB. Check their FAQ and tech notes for other options.
If you pursue CMYK, a LR discussion earlier this year noted that LR doesn't output files to this color format, but you can 'save as' from PS.
I second Printique - they still do silver halide printing for prints and books.