Color Camera

Color Camera

Is it possible to use a digital camera to calibrate the color balance of a TV?

If I color balance the digital camera at daylight (6500K) will that allow me to properly calibrate my TV's color balance by taking pictures of a shade of gray on the TV screen using the digital camera?

Using a digital camera in place of a proper color measurement instrument will not work when it comes to any aspect of instrument-based display calibration. Instrument-based display calibration is intended to precisely set the colorimetric white-point at multiple—typically predetermined—gray-scale levels. The standard white-point reference target for a video display device is CIE D65 (which correlates to a color temperature of 6504 K,) within a margin of error—or CIELUV delta E (dE or ∆E)—of 6 or less across a range of gray-scale levels spanning from 20 IRE to 90 IRE and a ∆E of no more than 10 at the gray-scale extremes. (Note: some techs prefer to report ∆u´v´ color difference values in addition to or as an alternative to ∆E. Also, some calibration techs prefer to use much tighter margins of error.) A digital camera simply cannot accomplish this fundamental measurement necessary to calibrate a display device.

Proper colorimetric measurement devices can be obtained at a reasonable price. A very effective tristimulus colorimeter, which performs as well as some professional devices that cost several orders of magnitude more, is the i1Display 2 from X-Rite (formerly GretagMacbeth.)

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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 target calibration reference point to ensure accurate color reproduction not the derived CCT 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. Do-it-yourselfers and knowledgeable, well-trained display calibration technicians should be well aware of this very important fact.

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[PDF] Calibration – What Is WRONG With This Picture?

http://www.sencore.com/uploads/files/WhatIsWrong.pdf

“Picture Perfect: TV Calibration Demystified”

http://www.soundandvisionmag.com/features/2007/01/picture-perfect-tv-calibration-demystified

“Ten Steps to Set Up Your New HDTV Without a Calibration”

http://www.hdtvexpert.com/?p=259

Secrets of Home Theater and High Fidelity
– “CalMAN Calibration Bootcamp: A Crash Course in the Science of Calibration”

http://www.hometheaterhifi.com/technical-articles/898-spectracal-calibration-bootcamp-a-crash-course-in-the-science-of-calibration.html

– “Professional Display Calibration: What It Is and What It Means to Your Home Theater Experience”

http://www.hometheaterhifi.com/technical-articles/488-a-secrets-technical-article.html

– “DIY HDTV Calibration Software Overview: A Comparison of ColorHCFR, ChromaPure, and CalMAN”

http://www.hometheaterhifi.com/diy/813-diy-calibration-overview.html

CNET Video: “How to Calibrate Your TV”

http://reviews.cnet.com/Calibrate_your_TV/4660-12443_7-6534987.html

“How to Calibrate your HDTV with Avia-Digital Video Essentials and DVE”

http://www.ramelectronics.net/Video-calibration.ep

Avical’s DVE User-Level Video Calibration Tutorial

http://www.avical.com/articles/avicals_dve_user-level_video_calibration_tutorial.html

AWH - How to Calibrate a Television FAQ

http://myweb.accessus.net/~090/how2adj.html

Is D6487K too low of a color temperature for an LCD TV?

http://answers.yahoo.com/question/index?qid=20080324173810AAHkg1g

AV Science (AVS) Forum
– Display Calibration

http://www.avsforum.com/avs-vb/forumdisplay.php?f=139

– Display Calibration Archive (2005-01-01 through 2006-12-31)

http://archive2.avsforum.com/avs-vb/forumdisplay.php?f=139

– ISF Calibration Discussion and Information

http://www.avforums.com/forums/forumdisplay.php?f=311

– Basic Guide to Color Calibration using a CMS (updated and enhanced)

http://www.avsforum.com/avs-vb/showthread.php?t=852536&pp=60

Display Calibration Resources

http://docs.google.com/Doc?id=dhpmqnbb_4g8mtjzdf

TweakTV - Tutorials

http://www.tweaktv.com/tutorials/index.php

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Spears & Munsil
– High Definition Benchmark Blu-ray Edition

http://www.spearsandmunsil.com

– [PDF] High Definition Benchmark Blu-ray Edition User’s Guide

http://www.spearsandmunsil.com/pdf/UG_SM_HD_Benchmark.pdf

Joe Kane Productions
– Digital Video Essentials: HD Basics

http://www.videoessentials.com/DVE_HDBasics.php

– DVE Program Notes

http://www.videoessentials.com/program_notes.php

GetGray - Digital Video Calibration DVD Software (donationware)

http://www.calibrate.tv

AV Science (AVS) Forum
– New Calibration Disc (GetGray)

http://www.avsforum.com/avs-vb/showthread.php?t=586139&pp=60

– Calibration Meter Shootout

http://www.avsforum.com/avs-vb/showthread.php?t=958099&pp=60

X-Rite
– X-Rite Products

http://www.xrite.com/top_products.aspx

– [PDF] X-Rite i1 Monitor Solutions

http://www.xrite.com/documents/literature/en/985629_i1_Monitor_Solutions_en.pdf

 

CS55P - Snake Color Camera with Goose Neck Bracket - Spy Gadget - Home Security Store

Color Camera

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