Originally Posted by KenTech
32-31-30--32-31-30 is a warm, not cool, bias. So it should be a tad warmer, indeed.
Yes, with DCOL=0, and apparently(more or less it seemed, with perhaps an exception in the brighter tones - again don't trust my eyes enough for this) DCOL=1 as well.
I assume you intended that this "Cool" offset-setup be warm, not cool.
What I was trying to see, is if DCOL=1 would more or less "offset" 32-31-30-32-31-30 .... or in other words, "equal" a "non-offset"(so to speak) of 31-31-31-31-31-31 and DCOL=0 since you had said/discovered in previous post(and looking at greyscale only, portions of my experiment #2 seemed to indicate the same thing) :
So I set it to 1 and watched TV last evening. Seems equivalent to a usual conservative Cool offset of, say, 30-31-32 -- 30-31-32 and DCOL=0, at least at first try. Nothing weird; very discreet.
So, that's -1 offset from RDRV/RCUT, +1 from BDRV/BCUT, which might lead one to assume one effect of DCOL=1 might be to produce the same results as RDRV-1, BCUT +1, and all I was doing, in a sense was to "check" to see if such an assumption was true ... It wasn't ...
In other words, If an offset of 30-31-32-30-31-32 seems equivilent to DCOL=1 using 31-31-31-31-31-31, then I thought I'd check to see if an offset of +1 from RDRV/RCUT, -1 BDRV/BCUT(32-31-30-32-31-30) with DCOL=1 would be equivilent to 31-31-31-31-31-31/DCOL=0, which it wasn't.
But it brings up a potential experiment: Set CT to Cool, then add, say, +2 of DCOL, and try to cancel it with warmish "Cool" offsets. When you can't see a difference when switching from Neutral, you can note the offset-settings that canceled it. Then install their opposite coolish equivalents temporarily for the Warm offsets for testing. The question then becomes: Are the Warm and Cool settings, thus configured, identical? Or is ther something else going on with the DCOL=2-only Cool setting.
Yes, I thought of trying that as well last night, just as I was hitting the hay, so to speak ...
One tremendous value of the easy access to Sony's service mode that the set can be turned into a marvelous, UN-automatic display device with a few, simple changes.
Thank goodness! Additionally useful as well for those of us who have customized our pic modes ...
Interesting. Well, maybe the "dynamic" DCOL algorithm is this: Apply a cool offset in inverse proportion to the amount of color (saturation). Thus, colors would be less affected than, say, pale or white objects, grays, etc.
That did very much look like what was happening, but again, I only looked at it with the Dish EPG screen, and didn't spend much time on it ... As I increased DCOL, the cooler CT that resulted was obvious in the whites/grays present, seemingly without the colors being as effected .....
But this would be awful, no?
Yes, it would ... Don't know what's really going on with it at this point, though suppose it might take a little more work and experiments to come up with some sort of theory.
I suppose one might also want to consider the factory defaults for cool offset - RDOF~BCOF 31-31-34-31-31-34 and DCOL=1 --- perhaps also along with the Netural factory defaults for RDRV~BCUT ... Which, on my set at least(and apparently others whom have reported here) result in a quite cool CT for Neutral and cool offset ....
It seems to me the "warm offset"(my sets values match service code listing for the offsets, but not RDRV~BCUT) was probably setup such that factory adjustment of RDRV~BCUT would result in something "close" to 6500K CT (although unfortunetly it did not produce linear greyscale results on my particular set). And perhaps, one might assume, perhaps the RDRV~BCUT factory adjustment for "neutral" was also "supposed" to be for some particular CT, as well as some sort of "look" to result, and correspondingly, some sort of particular "look" for the "cool offset" ....
In which case, Just a thought(one which I doubt anyone will want to explore to much of an extent other than perhaps for short periods of experimentation!) perhaps one who is interested in sorting out what they may have been "going for" with the cool offset and use of DCOL=1 may have a better shot at it if they experiment with returning 1). RDRV~BCUT to the factory adjusted values, and the cool offset values to their defaults as well .... Then, perhaps one might also want to consider the Factory settings for the color decoder as well (RYR~GYB) .... Assuming(and this would probably be assuming a lot) of course the techs at the factory doing the adjustments on the set achieved the results Sony wanted ....
To be honest Ken, I only took a look at this a little as you asked for others thoughts and I had some extra time last night. At this point, from what I've seen so far can't think of why I might want to use anything for DCOL other than 0(and, my current cool offset of 29-31-32-29-31-32 seems to be working quite nicely for a cooler CT choice), so I'm afraid at this point I'm not very motivated to experiment further ... As allways, I Would be happy to double-check anything you discover on this, however ....