All my images in the APUG gallery have been made from a 16 bit grayscale negative tiff scan for I do a lot of digital imaging as well as analogue so I need a large file to make quality digtal prints on art paper. The images are then manipulated in PS to match the analogue print that I've made. I then prepare a small file to submit to the gallery by downsizing the image to 72ppi jpeg file that is generally 100 to 175k in size. I used to scan in RGB and convert to black and white using grayscale but I've long since abandoned that road.