To do this we are asked to take any JPEG or TIFF and first convert it to 16 bits per channel using Photoshop. I did a bit of googling to find out how to do this in Lightroom before posting to the OCA Photography forum for clarification. It turns out LR processes in 16 bit and exports JPEG at 8-bit. JPEG bit depth cannot be adjusted (so far as I can tell), but TIFF can be set at 8 or 16. So for the purpose of this exercise I exported a 16-bit TIFF. This is the image, a souvenir collection from a student who went to Mecca for Hajj.
