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Join Date: May 2008
Location: San Francisco - East Bay area
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Let's assume your measurements are accurate (not saying they are or aren't but if your meter is 5 years old or more, chances are the measurements aren't particularly accurate)...
The red and green are actually off quite a lot. This will be an easily visible defect with "memory colors"... colors you have seen a lot and "know" what color they should be... grass & trees, you expect to be certain shades of green. This display, if the measurements are accurate, will make all greens visibly too yellow. That display will also make reds too red. So stop sign will be a deeper red than it is in real life (as will "Target" red and "Coke" red, etc.). That error will also shift orange-ish reds towards red, so the tomato red color Chevrolet used on some of their 55-57 cars and Corvettes will look less orange than it does in real life, and more red. The errors will also oversaturate magentas and undersaturate cyans (which includes some shades of blue in the sky).
Then there's the issue of what the meter was intended to measure in the first place. If the meter was designed to be used with LCD displays, it may not be nearly as accurate when measuring a display that produces light from phosphors (CRT or plasma). I don't know anything, really, about the meter you are using. Most moderate cost meters are actually designed to be accurate with phosphor-based displays (CRT and plasma) but they don't work as well with LCD displays of any kind. With meters that measure phosphors and LCD differently, you would need at least 2 profiles or more that were generated based on a known-good meter fully capable of measuring the type of display you want to calibrate. That could mean a colorimeter optimized for each type of display technology or a spectroradiometer that is inherently accurate when measuring all types of video displays. I used a recently calibrated (a wasted $850 actually, it was remarkably accurate prior to calibration, but I have to calibrate periodically just so I can "prove it" if I have to) $14,000 meter to measure the iPad mentioned earlier. It is a hybrid meter using filters, but many more of them than are used in colorimeters and the type of filter used is not subject to much drift over time. There are so many filters used, this meter has the ability to measure any type of video display (like a spectroradiometer) accurately, but because it uses filters instead of the sort of measurements made by a spectro device, it is much better and faster at measuring low light levels than a spectroradiometer until you get into spectro meters selling for more than $25,000.
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