Originally Posted by thomasl
Don't the new Samsung plasma and LCD models from this year have a CMS via the Custom color space option? Are you upgrading or did the 71 have other problems?
The 71 had other problems and Samsung offered to exchange for a LN46A750.
The 750 (and the 650) have this Custom Color space option. I don't know if it qualifies as a full
CMS, but it has a lot of capabilities.
You can adjust luminance up or down of all (RGBYCM) colors.
You can adjust xy coordinates of all colors also, but within some limits. Each color RGBYCM has 3 sliders for RGB that can be adjusted.
Couple of examples: Like every color, Red has adjustments for Red, Green and Blue. The default is Red=50, Green=0, Blue=0. If Red is oversaturated and needs to be moved towards blue or green, then you can do that by adding some blue or green until you get it where you want it. If this makes the luminance of Red too high, you can reduce Red some, and maybe take away a little of the blue or green. You can get Red where you want it and at the right luminance. But if Red is undersaturated and needs to be moved away from Blue or Green, you can't since they are already at 0 and can't go lower.
In the Samsung Green is always too far to the left. A lot of Red can be added to green and the Green spot moves towards Red, getting closer to it's CIE spot, although slightly undersaturated.
Cyan by default is Red=0, Green=50, Blue=50. So Cyan can be moved back and forth between Blue and Green, and it can be pulled over towards Red if needed. If the Green primary is left off to the left of it's proper CIE spot, Cyan cannot be moved left to the line between Blue and Green, since Red starts off a 0. Again, by adjusting in unison (more or less) whatever colors are required to get Cyan to the desired spot, Cyan luminance can be adjusted quite precisely.
Since the (green and blue) primaries cannot be put perfectly on their CIE spots, I use the Accupel calculator to see what luminance (Y) values the primaries and secondaries should have as well as where they all should be attempted to be placed.
Is this the correct use of the Accupel calculator, btw? I ask this because another poster is telling me that this isn't how the secondary colors should be placed. Basically he says that, for example, Magenta should be placed on it's CIE spot, while the Accupel calculator assigns a lower dE to placement of Magenta not on it's "perfect" CIE spot but opposite the white spot (D65) on the line between Blue and Red. He agrees that this is the 'definition' of Magenta, the secondary color of Green, but he says that the correct color of Magenta will only look right if it is on the perfect CIE location and that a more perfect recreation of the original material can only come from using the CIE spec coordinates for the secondary colors, regardless of where the primary colors' coordinates are.
Interestingly, gregr came over to our discussion and seemed to agree with 'the other guy', which left me wondering what the Accupel calculator is useful for.