View Full Version : Color Management, Radiance and Panasonic


ddingle
08-14-08, 06:42 PM
Hi! I have Colorfacts and an Eye One Gretag that I have been using for white balance adjustment for years now. I can get good results. We really like the Lumagen Parametric gray scale to improve tracking on any display. I now have an opportunity with a Radiance to fine tune the primary and secondary color points.
The plasma is 65" Panasonic PF10 commercial series.
The process seems a little unclear? Meters tend to be variable and it is better to error on too much color as opposed to too little. This from the Lumagen website.
I will be trying tomorrow to see what I can accomplish. I know this is asking for alot,but any tips or suggestions or direction for more info. I would appreciate it.
Any particulars on the Panasonic displays color points out of the box would be valuable as well.
Thanks in advance
Dallas

TomHuffman
08-14-08, 08:40 PM
As long as the light level is high enough, you'll get excellent results from the i1.

Just measure the built-in test pattern for each color, or an external pattern if you like, and use the provided controls to adjust the hue, saturation, and lightness of the primaries and secondaries.

I guess I don't know exactly what you are asking.

ddingle
08-14-08, 10:30 PM
Thanks Tom! I guess having never fired up the Device primary section of Colorfacts I did not know what to expect or how it interacts with the Lumagen test patterns.
Are there any FAQ sections on adjusting color points here on the Forum?
I assume the Panasonic commercial plasmas have over saturated colors like most displays?
I will be hacking away on it tomorrow. I will add more details on my results when I complete the process.
Dallas

TomHuffman
08-15-08, 12:16 AM
The Radiance adjusts the color points by color addition.

So to desaturate red, for example, you add equal parts of green and blue. To adjust hue you add unequal parts of green and blue. To decrease lightness, remove red from red.

For the secondaries to desaturate yellow, for example, add the complementary primary, blue. To adjust hue add unequal parts of the contributing primaries, red and green. To reduce lightness, remove equal amounts of the contributing primaries.

ddingle
08-16-08, 12:03 AM
The Radiance adjusts the color points by color addition.

So to desaturate red, for example, you add equal parts of green and blue. To adjust hue you add unequal parts of green and blue. To decrease lightness, remove red from red.

For the secondaries to desaturate yellow, for example, add the complementary primary, blue. To adjust hue add unequal parts of the contributing primaries, red and green. To reduce lightness, remove equal amounts of the contributing primaries.

I calibrated the gray scale first on the Lumagen/PF10 combo. Really nice picture! Actually even without the Lumagen the Panasonic 65" tracked about as good as needed. The Radiance did smooth out some small bumps.
I did check the Color Points. Easy to do using the test patterns in the Radiance and the Colorfacts software. It actually looked like the blue and red tracked dead on with the reference with the green slightly lower than reference.
The picture looked really really good. So I did not attempt any changes. I will try color point adjustment at home where I can really spend some time with it.
Thanks

ddingle
08-19-08, 06:59 PM
I have read a review of the Panasonic PF10 commercial series plasmas. There is an indication of fairly accurate color decoding with a slightly inaccurate green. Just what I had observed. Good news for my testing procedures.
I may just interject that the combination of the Pana and Lumagen after calibration is about as good of a display as we have installed. I suspect Runco's 65" ($18,000) is based on the same panel.
The Radiance and 65" Pana retail for about $11500. Better value!

Gordon Fraser
08-20-08, 04:23 AM
You can find a tech tip on gamut calibration here
http://www.lumagen.com/testindex.php?module=manuals

ddingle
08-20-08, 09:06 AM
You can find a tech tip on gamut calibration here
http://www.lumagen.com/testindex.php?module=manuals

Thanks Gordon! I found that tech tip kind of vague. I guess I need more hands on.