There was a major update of the firmware for SIGMA fp. There are some some interesting improvements, and the "Color Mode (corresponding to Picture Profile in Nikon term) Off" is one of them. The unprocessed images look as if they were shot in some log profile. Since I had purchased the camera, I've felt that Sigma's RAW (DNG) images were a bit too contrasty even in the "neutral" color mode. So, I really like this new "off" setting because I can now make the images in a natural tone.