When TIFF is the right output
TIFF is the archival / print-production format — lossless, multi-layer, supports CMYK for print, embedded ICC colour profiles. Scanned documents (some banks and legal archives still specify TIFF), print shops handling high-DPI artwork, and medical imaging (DICOM often wraps TIFF) are the real use cases. File sizes are large; TIFF is not appropriate for anything shown on-screen or shared via web.