Originally Posted by HDTVChallenged
To me, it seems that this is one of those things that takes far more effort to get wrong than it does to get right. If you design it as a LUT(ish), then it doesn't matter where the contrast is set, the 10 (or more) adjustment points will be tied directly to the input values (or ranges of values.) There would still be "interactions" with the contrast and brightness, but you would be sure that the control for 100% stimulus would always be centered at ~235 digital, etc, etc.
Simple. Pretty hard to mess it up.
The only reasons I can see for *not* doing it this way would be an insufficient number of internal processing bits (banding a/o dynamic range compression) or concern over additional processing "lag." Perhaps its a plasma thing?
I think Samsung's calibration controls/picture settings are known for using a high number of internal processing bits (pretty sure Doug Blackburn posted something about this several times). However, it's not uncommon to see issues with the 10-pt controls and even with the 3D CMS (some samples have a broken CMS that doesn't work like it should and so using the Auto Color Space preset is the only good option for those samples). Also, the N/D modes on some Samsungs (that are unlocked in the SM but are found in the user menu once unlocked) are often broken in varying ways. For example, the N/D modes on my EH series LED-LCD generate much more banding on continuous R, G, and B ramps than Movie pic mode or even Standard pic mode (both Movie and Standard can be calibrated to the same level of accuracy on my set, just with different numbers for stuff like contrast, color, and white balance). Furthermore, the black level measures quite a bit higher in the N/D modes than it does in Movie mode and that is with both modes calibrated to match each other (and both modes disable auto-dimming so the backlight is fixed).
My point is that Samsung seems to have gotten their 2-pt controls (and basic controls like brightness/contrast, color/tint, and sharpness) right across normal calibrate-able pic modes (Movie and Standard) but more advanced areas like 10-pt and CMS are much more hit or miss as are the N/D modes in general. Furthermore, this has been going on for a very long time and it seems fixing these issues is not a priority for Samsung (probably since calibration is not a priority for ~99% of consumers).
And while on the subject of picture settings/features that are often wonky on Samsungs, there is the issue with Auto Motion Plus (their frame interpolation feature), which is broken on many Samsungs made in the last several years... with issues like frame skipping, excessive judder, and other artifacts.