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If you've just dropped S$5,000 or more on a new TV or projector, chances are you're serious about home theater. For true videophiles, the most effective--and expensive--way to get theater-like pictures is to have the display professionally calibrated. But some TVs perform well enough out of the box that you may not consider professional service a worthwhile investment. This section will help you decide.

CNET US Labs uses Sencore's CP5000 color analyzer to calibrate the color temperature of most TVs reviewed.

What do the pros do?

Although the service you get will vary, professional calibrations almost always involve a few common steps aimed at improving the image. Many of these require accessing the display's internal service menu and measuring the image with test equipment--two reasons why the service calls for a trained professional. We strongly advise against tampering with the internal service menu unless you know what you're doing.

Here are the services included in a typical calibration:

Direct-view and flat-panel TVs: Set grayscale to the NTSC standard of 6,500 Kelvin, improving color accuracy of the entire palette; set contrast, brightness, color, and so on using test patterns designed specifically for each of these controls; optimize overscan and picture position, enabling display of more of the incoming picture; correct red push in the color decoder when possible; optimize all DVD input sources using DVD test patterns and HDTV input using an HDTV test-pattern signal generator.

Rear-projection and front-projection TVs: All of the above for non-CRT displays; for CRTs, also converge all aspect ratios and focus the three guns to maintain image sharpness.

Other advanced services include mechanical focus of projector lenses, custom setups for every aspect ratio and input source, full projector installations from scratch, and the like.

Is it worth it for my TV?

Professional calibrations can be costly and if you're on a budget, we recommend you first purchase one of the test discs and follow its DIY calibration procedure. If afterward you still feel like your set isn't performing as well as it should or you simply want to guarantee the best picture, you should get a calibration.

One of the most important components of professional TV service--and one that definitely requires special gear--is grayscale calibration. This procedure equalizes the color of gray at various light levels, from very dark to very bright, at the NTSC standard color temperature (a.k.a. white balance) of 6,500 degrees Kelvin, or D6500K. DVDs are created to be displayed at that color temperature, so if your TV is set to 6,500K, you're that much closer to seeing the image the director intended.

Some TVs, however, have color temperature presets that come close to 6,500K. If that measurement comes close to this standard, then the set is in less need of a grayscale calibration. Note that very few TVs come close to the ideal color temperature, even in their warmest mode.

The Imaging Science Foundation is a good source for qualified calibrators.

How do I get a calibration?

There are two ways to get your display calibrated. If you bought the set at a specialty retailer, the vendor would probably be able to refer you to someone who could perform the service. Some retailers even include calibration in the price of the television.

The more common way, however, is to retain the services of an independent contractor. However, there are limited calibrators operating around Asia. We recommend you choose a contractor with calibration equipment who has been certified by the Imaging Science Foundation and who owns his or her own calibration equipment. Note that they may perform their services only in conjunction with full audio/video installations and may not offer separate video calibrations.

Tags: Picture, TV, DLP, Image, movie

 

gml

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gml says...
Hi David,
Thanks for the HDTV tune-up tips. Its been a real eye opener and also very informative and useful for ordinary people like us.
I was just wondering if HDTV manufacturers could come out with auto calibration for HDTV something that the audio manufacturers have succeeded in introducing the new A/V receivers that could auto calibrate the speaker set-up, volume, etc. Its a great help to for audio enthusiast.
So do you think, manufacurers of HDTV would come up with auto calibration for HDTV with regards to Brightness,Contrast, Black level, Sharpness, Colour Tint, Colour Temperature, etc. It would sure take away the confusion that the layman has in trying to calibrate the HDTV manually. Keeping my fingers crossed for the day to arrive.

George Martin

Nov 26, 2008 08:59