Color Lcd
Is D6487K too low of a color temperature for an LCD TV?
I just paid to have it calibrated, and this is what the printout reads. The picture almost looks dull at times.
Your experience is not out of the ordinary. A display mode (whether calibrated or not) that operates at D65, or a “correlated color temperature” (CCT) of 6500 K, can indeed make a display seem lifeless and “dull,” particularly if the display you’ve been using was previously operating at an abnormally high (i.e., bluish) white point, or a CCT of roughly 8000 K to 9000 K or higher. This effect plays an important role in the fairly well-known sales strategy used by display manufacturers, (especially to those of us that have regularly been following the display industry for many years,) in which consumers consistently demonstrate a strong preference for displays with a livelier, brighter, more ‘bluish’ video image, over a display that produces a more accurate, “6500 K” video image.
Most display calibrations involve disabling any and all picture enhancement settings that often add unnatural enhancement to the video image. It is also likely that after optimizing the picture settings on your display that the Brightness (black level,) Contrast, aka Picture (peak white level,) and Color (chroma saturation) controls, have been lowered to their optimal operating levels. Furthermore, it is also possible that your viewing environment was not (properly) factored into the optimization and calibration process, which it should have been.
From the information you’ve given it is difficult to tell if you hired a fully competent calibration technician/service. Nevertheless, first things first… If you have the option make sure that the gamma setting for your display is set to the recommended value of 2.5 as a starting point after which you may want to experiment by tweaking this setting between values of 2.1 and 2.5 to see if it helps, again if you have that option. Your remaining options (from best to worst) are: learn to live with the post-calibration results (providing they are reasonably accurate); find ways to reduce any ambient light that may be present in your viewing environment – this will help improve your “ambient contrast” level; and if all else fails SLIGHTLY increase the Color (chroma saturation) and/or Contrast or Picture (peak white level) settings on your display in an attempt to compensate.
If you flat-out do not like the color calibration results and/or display settings simply choose one of the other display or picture modes that was not calibrated. This way, by retaining the calibrated display mode(s) along with the unaltered stock factory display mode(s), you would have the ‘best’ of both worlds should you ever desire (or require) the ability to view an accurate color video image or a video image that is more to your liking.
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Technical Addendum
CIE Standard Illuminant D65 is the accepted worldwide industry standard white point reference for video displays including HDTVs. (Note: a CCT of 5400 K is the accepted industry standard for displays used in graphic arts applications.) For motion picture and video applications D65 should ALWAYS be the targeted calibration reference point to ensure accurate color reproduction not the derived value of 6500 K.
In the field of colorimetry and color science 6500 K is referred to as a “Correlated Color Temperature” and is represented in two-dimensional color space, aka a CIE chromaticity diagram, by a straight LINE—specifically an “isotemperature line”—that transversally passes through a point on the Planckian (aka blackbody) locus. Any pair of chromaticity coordinates lying along the 6500 K isotemperature line, no matter their visual difference, will produce a corresponding CCT of approximately 6500 K (though only one pair of coordinates will be closest to the ideal D65 source point.)
D65, being a specific reference point and not a line, is a substantially more precise target—and is therefore preferred—for precision display calibration as opposed to a potentially infinite number coordinates along a line. Knowledgeable, well-trained display calibration technicians should be well aware of this very important fact, if not avoid hiring any calibration technician that lacks this essential knowledge. Furthermore, using the proper precision measurement equipment a calibration technician will always have all of the necessary data to provide to his or her client. If the technician fails to provide ALL of the pre- and post-calibration measurement data (including ΔE for each white point measurement) in their calibration report it is because he or she chooses not to or (it’s more than fair to assume) he or she simply lacks the proper training and knowledge. Again, avoid hiring such calibration technicians and/or services.
######## RESOURCES AND REFERENCES ########
Wiki: Gamma correction
http://en.wikipedia.org/wiki/Gamma_correction
Wiki: D65
http://en.wikipedia.org/wiki/D65
What is correlated color temperature?
http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/whatisCCT.asp
DELTA Application Note I102:
Correlated Colour Temperature
http://www.delta.dk/C1256ED600446B80/sysOakFil/i102/$File/I102%20Correlated%20Colour%20Temperature.pdf
CIE-1931 Chromaticity Diagram
http://home.wanadoo.nl/paulschils/10.02.htm
Understanding Light and Color and the Operation of a Color Analyzer part II
http://www.sencore.com/newsletter/Apr02/ESTColorArticlepartII.htm
Joe Kane Productions – Resources
http://www.videoessentials.com/resources.php
Charles Poynton – Color Technology
http://www.poynton.com/Poynton-color.html
http://www.poynton.com/notes/links/color-links.html
Charles A. Poynton, “High Definition Television and Desktop Computing”
http://www.multimedia.edu.pl/mmLab/MultimediaPL/txt/Poynton.pdf
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ITU-R Recommendation BT.709
http://www.itu.int/rec/R-REC-BT.709/en
ISO 10527:2007(E)/CIE S 014-1/E:2006:
CIE Standard Colorimetric Observers
http://www.cie.co.at/publ/abst/s014_1iso.html
ISO 10526:2007(E)/CIE S 014-2/E:2006:
CIE Standard Illuminants for Colorimetry
http://www.cie.co.at/publ/abst/s014_2iso.html
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