Plasma Owners - How do you calibrate saturation? - Page 4 - AVS Forum
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post #91 of 94 Old 06-18-2012, 12:35 PM
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Quote:
Originally Posted by TomHuffman View Post

Doug, is the value for blue a typo? I can't imagine any color whose CIE94 is 0.75 with a CIELUV of 8.4. What is the xyY value?
Also, I think that the poster is referring to color accuracy throughout the entire color space, and not just at the gamut boundary.

No, the blue uv error wasn't a typo, the data was copied from CalMAN and pasted into Excel. CalMAN did the error calculations for dE 1994 and dEuv.

Coordinates for blue were

x 0.1551
y 0.061
Y 0.5787

Those coordinates don't seem far enough off for the Blue dEuv to be 8.7, but that's what CalMAN calculated. The patterns were 75% (roughly 50% stim).

Oddly, the out of box coordinates were worse but the dEuv came out at 5.8
The factory coordinates were 0.1553 / 0.0596 / 0.686

Target coordinates for blue are listed as 0.15 / 0.06 / 0.6728 for the Factory (out of box)
and Y target for the calibrated result was 0.5823 (there was a change in luminance between out of box and calibrated)

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post #92 of 94 Old 01-05-2013, 11:30 PM
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Quote:
Originally Posted by Doug Blackburn View Post

No, the blue uv error wasn't a typo, the data was copied from CalMAN and pasted into Excel. CalMAN did the error calculations for dE 1994 and dEuv.
Coordinates for blue were
x 0.1551
y 0.061
Y 0.5787
Those coordinates don't seem far enough off for the Blue dEuv to be 8.7, but that's what CalMAN calculated. The patterns were 75% (roughly 50% stim).
Oddly, the out of box coordinates were worse but the dEuv came out at 5.8
The factory coordinates were 0.1553 / 0.0596 / 0.686
Target coordinates for blue are listed as 0.15 / 0.06 / 0.6728 for the Factory (out of box)
and Y target for the calibrated result was 0.5823 (there was a change in luminance between out of box and calibrated)
The Y standard for blue is 0.0772. 0.5787 is wildly over-bright for blue. You must mean 0.0579. For THAT color, the CIE94 value is 3.8 and the CIELUV value is 15.5.

Tom Huffman
ChromaPure Software/AccuPel Video Signal Generators
ISF/THX Calibrations
Springfield, MO

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post #93 of 94 Old 01-06-2013, 07:55 AM
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Originally Posted by Monitorman View Post


Hi ndaa75,


The best way to set Color/Saturation on any display with a Blue Only feature like the Samsungs is to use SMPTE Color Bars (75%), separate Blue and adjust according to the panel. Typically I set Samsungs at either 46 or 47 for Color and it looks correct. Try that.


Hello, do you still set the Color/Tint controls if you have a full featured CMS? Is it necessary to do both? I have a pn51d6500.
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post #94 of 94 Old 08-01-2013, 09:17 AM
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I see this is an old thread, but here's how I worked it out on my Panasonic VT50. (I should mention I'm not an ISF, just a dude with a meter)...

I don't know to what it extent it's just the CMS on the VT50 but I found that the lums controlled the linearity of the saturation levels for a color.

I selected a reference color, red, since I think that's the most important one (because of flesh tones). I went back and forth and adjusted its lum setting and the main color control until its saturation level was accurate at 25%, 50%, 75% and 100%.

Guess what? That was the correct lum setting as measured normally, and it left the main color setting at 50. Perfect!

I never touched red again.

For the rest of the colors I first calibrated the lums in the usual way since they all need to match and I was not willing to mismatch them to ensure linear saturation for all the colors - (though sometimes I wonder how that would look).

Then I adjusted the discrete sat levels. Without using the lums to try to get them linear, I didn't know what to do but choose what sat level I cared about the most. I went with 75%. I think 100% is standard for Rec 709 but IMO by the time a color gets that pure it's kind of a "special effect" anyway. The only exception was yellow which I ensured was exactly correct at 50% because it's critical to flesh tones at the lower saturation levels (or that's my supposition anyway).

This required another adjustment to the lums, and so forth - one of those endless calibration loops you have to decide where to end.

Anyway, most of the sat levels worked out close to linear when the lums were correct.

I think it looks great. Sometimes the saturation seems high, but I've found I usually think correctly calibated TV's have too much color, so I'm not sure. When I have time - just for kicks - I'm going to experiment with setting the lums purely so that the saturation levels are linear, (if possible), and see what that looks like. It would be close settings to the ones selected from light output relative to white, and possibly less vulnerable to ABL(?)
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