János, Tóth F. wrote: > I tried to create a curves+matrix profile for a Nokia 5800XM display > from 12 patches (100% RGB + 9 gray steps between 100% and 0%) and > convert my main screen background image with Photoshop CS5. Hmm. You would need to make sure that it is either -aG or -aS (single curve/gamma), and gamma may be more reliable than shaper curves. If you added 50% color steps then you may get away with -ag. It would be interesting to know the fitting error. > Both were useless on the phone display. The skin-tone got better but > there was an awful amount of posterization/banding on both images (the > absolute intent was obviously useless but the other was also too > damaged, it didn't worth it). > (I guess that was a 6-bit display and the images were dithered and > saved to 8 bit, so even the dithering noise was distorted by the > internal quantization...) It's hard to equate 6 bit with the level of dithering you describe. Could it have been posterization due to a very inaccurate profile ? (Typically 6 bit dithered is hard to visually distinguish from 8 bit. Many an Apple user is unaware that they are using 6 bit displays that purport to be 8 bit - I certainly don't notice it on my MacBook). Graeme Gill.