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评测都是取自hometheather.com
47LE8500(LE8900/LE8600)
HT Labs Measures
Black: 0.002
White: 31
Full-On/Full-Off Contrast Ratio: 15,500:1
These readings were taken in the Expert1 picture mode with the Backlight on 35, the Contrast on 70, and the Brightness at 54. The Vivid mode produced a peak white level of 120 foot-lamberts—a level that was uncomfortable to watch for more than a few minutes in typical evening room lighting.
The Color Tracking charts below show how well a display adheres to the D65 standard white point. The tighter the overlap of the three primary colors, the nearer the result is to D65. The Before Calibration chart shows the result in the fixed THX Cinema mode. The After Calibration chart shows the full final calibration taken in Expert1, in the Warm color temperature setting, fine-tuned with the 10-step white-balance red, blue, and green controls. The After Calibration result is outstanding, with a Delta E of under 1.0 from 40 IRE (low to mid brightness) to 90 IRE (just short of peak white) and no higher than 2.5 elsewhere. Delta E is a figure of merit that indicates how close the result is to the standard D65 white point. Most experts recommend a value of 4 or less, suggesting that the eye cannot distinguish any improvement below this level. Others recommend no more than 3 for a visually ideal result.
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Sony BRAVIA KDL-55XBR8 LCD HDTV HT Labs Measures(55x4500)
HT Labs Measures
Black: 0.000
White: 38.64
Full-On/Full-Off Contrast Ratio: Infinite
For the picture adjustments used in this review, go to www.HomeTheaterMag.com. The measurements here were taken in the Custom Picture mode, through an HDMI input except as noted, with the set adjusted for the most accurate picture in a darkened room.
It was still possible to see a very low level of brightness on the screen with a full-screen black image. That is, the Sony’s black level is not truly zero, nor its peak contrast infinite. Rather, it’s unmeasurable with our Minolta LS-100 light meter—which simply means that the black level was below the meter’s 0.001 ft-L minimum sensitivity.
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Panasonic Viera TC-P50G20 Plasma HDTV HT Labs Measures
HT Labs Measures
Black: 0.008
White: 30.22
All of the measurements here, unless noted otherwise, were taken in the THX Picture mode, through an HDMI input, with the Contrast control on 49, the Brightness on 60, and the other adjustments set as required for the most accurate image in a darkened room.
If judged in comparison with the Panasonic HDTVs we’ve tested over the past two years, the TC-P50G20’s black level and contrast ratio are merely average—although that still means comfortably better than average by overall industry standards. Two previous Panasonics have measured better, but one of them was the admittedly larger and far pricier ($10,000) Premier TH-65VX100U.
Both the Before Calibration and After Calibration color-tracking measurements were performed in the THX mode. The Before Calibration result, out of the box, was only fair, with Delta E readings that ranged from 1.4 to 5.8. After calibration, the maximum Delta E measured 3.6 at 30 IRE on the dark end, 3.6 at 100-IRE peak white, and under 2.0 at all other points.
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Panasonic VIERA TC-P58V10 Plasma HDTV HT Labs Measures
HT Labs Measures
Black: 0.005
White: 33.57
Full-On/Full-Off Contrast Ratio: 6,714:1
All the measurements were made in the THX mode. The full-on/full-off contrast ratio above was taken with the Contrast setting on 92 and the Brightness setting on 58.
This is the third best full-screen black level we’ve ever measured on a plasma set. It’s exceeded only by the last couple of generations of Pioneer KUROs (as a group) and the Panasonic Premiere TH-65VX100U professional model mentioned in the review. The latter was measured with the 25 IRE+PLUGE pattern on Digital Video Essentials: HD Basics, which allows for a slightly lower setting of the Brightness control than the Spears & Munsil High Definition Benchmark Blu-ray Edition used here. Using DVE on the TC-P58V10 produced a black level of 0.005 foot-lamberts—the same result we obtained on the TH-65VX100U. The latter sold for $10,000 when we reviewed it back in April 2009. Other recent Panasonic consumer sets have had considerably higher black levels, but they’re still consistently better than the current production plasma sets we’ve tested recently from LG and Samsung—the other two major set makers still in the plasma hunt.
The color tracking (measured in the Warm1 Color Temp setting) was fair at best out of the box. In our experience, even THX-certified sets need some calibration love. The calibration produced a better result, but I elected to let it go a little blue across the low-mid brightness region (but no more than just a bit over 6700K) to avoid excessive red shift in the darkest grays. (The THX calibration was done in the service menu, starting from the Normal color temperature setting. The THX mode is called Cinema in the service menu.) The Delta E after calibration maxed out at 3.63 at 40 IRE and was under 2.2 at all other points.
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Panasonic Viera TC-P42G10 Plasma HDTV HT Labs Measures
HT Labs Measures
Black: 0.014
White: 25.97
Full-On/Full-Off Contrast Ratio: 1,855:1
All the measurements here, unless noted otherwise, were taken in the THX picture mode, through an HDMI input, with the set adjusted as needed for the most accurate within the requirements of the viewing tests in a darkened room.
The Panasonic had the next to the best black level and full-on/full-off contrast ratio in the group. While the Panasonic can produce a higher brightness level in other picture modes (as much as 80 foot-lamberts in Vivid), it looked best in our darkened room in its calibrated THX setting.
Due to a quirk in the calibration process and the fact that all the calibration controls are in a service menu, the Before Calibration settings shown here are for the Standard Picture mode and the After Calibration result is for a calibration in the THX mode—both of them in the Warm2 Color temperature setting. The Before Calibration result produced a Delta-E that ran from 3 to 9.1. (Delta-E is a figure of merit that indicates how close the color temperature comes to the ideal white point of D6500. The lower the number, the better. Experts generally recommend a maximum of between 3 and 4 for results that are visibly indistinguishable from lower values.) After calibration, it was 3.1 or less from 30 IRE to 100 IRE, increasing to 6.5 at 20 IRE.
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Pioneer Elite Kuro PRO-141FD Plasma HD Monitor HT Labs Measures
HT Labs Measures
Black: 0.001
White: 33.5
Full-On/Full-Off Contrast Ratio: 33,500:1
The full-on/full-off contrast ratio above (sometimes referred to as the peak contrast ratio, the sequential contrast ratio, or the dynamic range) is about as good as it gets. The black level shown here was the most conservative reading taken. With a black image, you can still see some illumination on the screen, but it is extremely dim and difficult to measure. I took 20 full-screen black-level readings. Eighteen of them measured 0.000, and two measured 0.001—the lowest reading possible with our Minolta LS-100 light meter.
I did use the ISFccc feature, but even without it, the PRO-141FD’s post-calibration color measurements were nearly flawless. The pre-calibration result shown here is for the Mid-Low Color Temp setting. Post-calibration, the result deviates from nearly perfect compliance only at the extreme ends of the brightness range. (The closer the three colors overlap, the closer the result is to the standard D65 white point.) These deviations were too small to be visibly significant.
The white triangle in the pie-shaped CIE chart shows the set’s color gamut in the Color Space 2 setting (Pure mode). It’s a virtual overlay of the ATSC standard (the black triangle, nearly invisible here). The Color Space 1 setting (not shown) was slightly oversaturated.
[ 本帖最后由 whindson 于 2011-3-6 20:28 编辑 ] |
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发表于 2011-3-6 19:07
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