Rajiv Mehra wrote:
Now while I have your attention, Graeme, what is the best way to prevent greyish blacks? even with this command........dispcal -v -y c -q m -w 0.313,0.329 -g 709 -p 0.5,0.5,1.7 -f1 -k0 g70-1......while watching movies after dispcal......fade to black scenes have elevated brightness. Also, the overall image lacks "punch" . I think it is reducing the contrast/brightness to correct the greyscale or something.
If you are aiming for a non-native white point, then it will reduce the maximum brightness, since channel values can only be reduced from white. so try it without -w 0.313,0.329. I'd be leaving -f alone (ie. not using -f1) unless you've determined specifically that it gives you the results you want, since -f1 will give a steep target curve that may reduce shadow detail near a non-zero black. Note that inaccuracies in the instrument reading very low levels may lead to a black that isn't quite as black as it should be, although the i1d2 isn't too bad in that regard compared to the Huey or Spyder2. The Eye-One Pro is probably better, as is the DTP92 and DTP94. Please note that since you're using -g 709, that you need to use ambient compensation to get the desired subjective result, or instead you should be using a gamma of 2.4, since this is what Rec 709 TV encoded images are assumed to be displayed on in a darkened viewing environment. Since you seem to be aiming for a subjective rather than technical calibration, it's really up to you to figure out what works. Graeme Gill.