Originally Posted by xtrips
Please, you are invited to make comments on all of the above. And especially, do you think there is a way to improve the green setting?
Gamma didn't help.
If the "green" error is large (around 15%), and if you are using YCbCr for input or output, then the most likely problem is that you have not set the YCbCr "Color Space" correctly.
I'll try to keep this simple: Color Space refers to the math used to convert the YCbCr data format used to store the movie on the discs to the RGB data format the display needs to light up the pixels. One of the more subtle differences in HD video is that different math is used to do this conversion for SD and HD video -- due to different "color primaries" specified for the HD standard.
Now the way things are SUPPOSED to work is that HD color space is used whenever the video sent between two devices is transmitted at 720p or higher, and SD color space is used for lower resolutions. But some devices get this wrong and the Anthem offers a way to force either the input side or the output side to use a specific color space despite the resolution.
If you have this problem, greens will be dull or hot by 15% depending on which way you've got it wrong.
You need to figure out whether the problem is on the input or output side. Use the Anthem's internal test charts to check the output side first. The Setup / Video Output / Color Space setting adjusts the output side. Change it from Auto to HDTV or SDTV as necessary to force the correct color space. Since you are sending 1080p/24 to your display, the Auto setting and the HDTV setting should produce the same results.
When you have the output side correct, then adjust the input side of the Anthem (Video Source Adjust / Picture / Input Color Space for each input that is giving you problems). Since you are sending 1080p/24 to the Anthem, the Auto YCbCr setting and the YCbCr HDTV setting should produce the same results. NOTE: The RGB selection found in that same menu is a separate setting that only applies when RGB data format is being sent to the Anthem. It is not really a Color Space choice (RGB doesn't have "color space"). RGB comes in two flavors of data format and this selection sets the Anthem's input to expect one or the other.
You may also discover that HD vs. SD Color Space issues are most easily corrected by making a setting change in your source or display. Again, since you are sending 1080p for input and output, the HD YCbCr Color Space is the one that the source, the Anthem, and the display really should all be using. But some devices have bugs which won't let you turn that on properly.
If those don't fix it for you, and particularly if you still see the problem on the output side (using the Anthem's internal test patterns), and if the problem is relatively minor (i.e. greens off, but only a little), then the odds are your display has a "color decoder" problem. A "color decoder" error simply means that the Color and Tint settings which are correct for Blue are not also correct for both Red and Green.
Some display manufacturers design in deliberate color decoder errors to give their displays a unique "look" in competition to other displays. Typically there are no user controls to correct a color decoder error in the display, but with some displays, choosing a different "picture mode" will also select different color decoding in the background. There may also be Service Menu settings in the display that an ISF technician could access which will adjust the display's color decoder. Check the appropriate forum thread here for your display to see if any such settings are known.
Minor errors in green due to color decoder problems can probably be safely ignored. Fiddling with the Custom Gamma Correction curves in the Anthem (the separate curves for the 3 primary colors -- available via the Live Video Settings Editor application) may cover this up a bit, but will probably do more damage to the image than if you just ignored the color decoder issue.
When faced with minor color decoder issues, generally I like to set the Color and Tint controls for the best "compromise" result for all 3 of Blue, Green, and Red, rather than targeting perfection in any one of those.
Back to "color space": Another possible fix for "color space" problems is to force RGB data format either for input or output. It's OK to use RGB on one side and YCbCr on the other -- the Anthem does the conversion. You should use Studio RGB or this unless you find it impossible to calibrate black levels properly from your nVidia card with Studio RGB, in which case you will be forced to use Extended RGB.
Sending RGB data format gets around the whole Color Space issue. However if your display has a color decoder problem, that will likely remain even if you send it RGB.
One other CAUTION: There is a bug in the current Anthem software that setting Color or Tint on the input side (Video Source Adjust / Picture for the current input) will INCORRECTLY also alter the output of the Anthem's internally generated test patterns.
That means that when evaluating the Anthem's internal test patterns and adjusting your display's controls to best reproduce them, you need to temporarily return the Video Source Adjust / Picture / Color and Tint controls to their factory default values (50) for the Anthem input that is currently selected.