If you're going to make any adjustments to the image, I'd use 16-bit per channel, and convert to 8-bit after you've made your adjustments. If you need to save work in progress, use TIFF as it supports 16-bit per channel.
If you're going to make any adjustments to the image, I'd use 16-bit per channel, and convert to 8-bit after you've made your adjustments. If you need to save work in progress, use TIFF as it supports 16-bit per channel.