Reducing color depth to decrease disk usage
Based on a simulation of user activity, changing the color depth from 16-bit to 8-bit reduces disk space by 42%. Changing the color depth from 32-bit to 16-bit reduces disk space by 34 to 39%. If you can accept the lower quality video playback, changing the color depth from 32-bit to 8-bit reduces disk space by 62 to 65%.