Video Calibration

ChromaPure 2.2 Video Calibration System and Lumagen Radiance Mini-3D Video Processor

ARTICLE INDEX

ChromaPure 2.2 Features

Beyond the Auto-Calibration feature, ChromaPure has added a lot of new features since we last used it. I tested it out using the Radiance as a pattern generator to make the calibration process as easy as possible.

One of the first things that I noticed was that ChromaPure now had patterns to help you set the Brightness and Contrast of a display correctly. This is one of the few things I felt was really lacking in the previous version, so I was glad to see it was fixed.

The other main addition that assisted in my Samsung PN50B650 plasma calibration was the addition of an RGB mode for color management. The previous version had HSL, which I was able to use to get my display correct but it was not as easy, and the new RGB mode worked perfectly. Unfortunately even better controls still didn’t let me dial in Blue correctly, but that’s the fault of the display and not ChromaPure.

One new feature is the Advanced Color Management section. Virtually every review you see of a display or projector shows the calibrated results for the CIE diagram: 100% saturations of Red, Green, Blue, Cyan, Yellow, and Magenta. ChromaPure will allow you to measure the intermediate saturations (25%, 50%, 75%) and intensities (25%, 50%, 75%) to see how your display performs with those. This is also an area that the Lumagen Radiance can really improve upon the CMS inside of your display.

While many display CMSs can let you get the 100% value correct, they don’t perform the internal calculations for the values between 100% and 0% correctly. Color math is really a 3D model and not a 2D model, with lines that can curve instead of being a straight line. As people that looked into this online at the AVS Forums found out, even if your display seems to calibrate perfectly with its internal CMS, your picture might still look a little off since it is not getting those other values correct. Most content that we view isn’t at 100% intensities as well, so having the midranges be more accurate is often desirable.

What some people have found is that calibrating using 75% values instead of 100% values can lead to a more accurate overall color spectrum with their internal CMS. While the 100% values might be further off, which makes the calibration report look worse, the 25%, 50% and 75% values are far more accurate, which results in a better overall image.

However, previously the only calibration software that I had worked with that easily supported this was ColorHCFR, which is now very outdated in terms of meter support. ChromaPure now supports these readings with the Advanced Color Management module and will let you see a much better overall representation of how your display does with color than the traditional CIE graph does. Right now you can’t do these measurements with an automated method (The Radiance contains the saturation patterns, and the AVS HD 709 Calibration disc contains the saturations as well), but in the next version it will support the Radiance for this measurement. Below you can see the results from this module using both an internal CMS in my Samsung on top and the Radiance below. While both have errors, those on the Radiance tend to be smaller across the different saturations.

Another feature that was added to ChromaPure were new Professional and Plus editions. These versions add support for higher end meters, signal generators such as the AccuPel 5000, and other options that are utilized by ISF and THX professionals. These are likely outside the scope of the average DIY calibrator, but ChromaPure has all the features these and can grow if your interest in calibration expands.