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Running The Gamut(s)

Color measurement for electronic displays is getting easier and easier.

For best results, make sure the image grayscale is set for widest dynamic range, not brightest image or highest contrast. If not, you'll likely see much bigger color shifts at the high and low end of the grayscale test patterns you use, resulting in noticeable magenta, yellow, or cyan tints at different luminance levels.

While I opted for the ColorFacts system, there are other tri-stimulus color analyzers for these tests. Two that come to mind are the OpticONE, sold by Ovation Multimedia, and Sencore's ColorPro 5000 and ColorPro 5001 “pocket” analyzer. Whichever model you choose, make sure its sensor can keep up with the imaging speeds and refresh rates of different display technologies, so you can read color coordinates and luminance values accurately.

Or, you could just trust your eyes and be off by a few hundred degrees (not so noticeable) or a few thousand degrees (very noticeable) in your calibration.

Pete Putman is a contributing editor for Pro AV and president of ROAM Consulting, Doylestown, PA. Especially well known for the product testing/development services he provides manufacturers of projectors, monitors, integrated TVs, and display interfaces, he has also authored hundreds of technical articles, reviews, and columns for industry trade and consumer magazines over the last two decades. You can reach him at

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