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>Monitor Calibration with the ColorVision Spyder2PRO Monitor Calibration with the ColorVision Spyder2PRO Review Date: July 2007 ColorVision's Spyder 2 Pro product is the one that we eventually settled on for in-house use here at Imaging Resource. It consistently did a good job calibrating the monitors we tried it with, seemed less prone to getting lost in the weeds with difficult-to-calibrate monitors, and also provides a good capability for matching multiple monitors to a common standard. No product is ever perfect, but we found the Spyder2PRO to be better than most and it offers a flexibility found in few other monitor calibration solutions. (It's worth noting though, that we found it almost impossible to precisely match CRTs to LCDs with any of the solutions we tried, and the Spyder2PRO ran with the rest of the pack in that respect.) Our 'reviews' of monitor calibration systems aren't reviews in quite the same sense that our camera reviews are. This is because, by their nature, we have no objective, absolute way to evaluate the quality of the calibrations the calibrators generate. All we can do is make subjective comparisons between how the screens look.
While that has a little value, we're more than a bit leery of advising our readers based on purely subjective data. Bayonetta Patch 1.01 more. We'll make some references to calibration quality at the end of each review, but suggest that you take these comments with a large grain of salt. Unless we say that a calibrator is just out-and-out unsuitable, we recommend that you base your purchase decisions more on the features you need, what you can discern about ease of use from our write-ups, and on price. All that said though, the Spyder2PRO colorimeter sensor does sport a feature that is (as far as we know) unique in the field, namely that it measures seven different colors, rather than just the usual red, green, and blue. This gives it a more complete picture of a display's colorimetric characteristics, which appears to be a significant help in calibrating LCD displays. (The considerably more expensive Gretag MacBeth EyeOne Pro is a true spectrophotometer, collecting data at many points across the color spectrum, but our admittedly subjective tests didn't find a noticeable advantage to the Eye-One Pro's finer-grained color measurements. To the contrary, we felt that the results of repeated calibrations were more somewhat consistent with the Spyder2PRO.) For more on why you need monitor calibration if you're serious about digital photography, see our article.
What does monitor calibration do? When you 'calibrate' a monitor, there are really three steps involved, characterization, correction, and profiling. Characterization This part of the process involves such things as determining: • What colors are the red, blue, and green channels of the display? • How does the light output of channel vary as the pixel value is changed from 0-255?
• What color are the pure grey values (equal RGB numbers, for instance 200/200/200 should be a light-medium grey, with no color tint to it. Ntu Nie Masters Program here. Correction Once the software knows how the display is behaving, it loads correction curves into the video card (or sometimes the monitor itself), to produce a smooth tone curve and neutral greys. This step also adjusts the monitor to the gamma setting and color temperature that you want. (The sRGB standard uses gamma 2.2 and a white point of 6500K.) Profiling With the display producing smooth tones and neutral greys, the software can create a color profile describing the display's color characteristics. Programs like Adobe Photoshop can use display profiles to compensate for the known quirks of a display device, and insure accurate color rendering. The review below goes into quite a lot of detail on the calibration process, and our observations about it.