Автор: tantris
Дата: 18-02-11 15:47
Покрай множеството теми за цветопредаването на тоз или онзи дигитален фотоапарат, потърсих данни по въпроса в www.imaging-resource.com.
Ето на какво попаднах.
sRGB Accuracy Comparison
Копирах изводите за канони и никони, щото с други марки не съм снимал. Сигмата я сложих за разкош![[smilie3]](https://photo-forum.net/forum/smileys/smilie3.gif)
Та цифрите, когато са проценти е по-добре да клонят към 100, а другите дето е по-добре да клонят към 0 ![[smilie5]](https://photo-forum.net/forum/smileys/smilie5.gif)
The Canon 5D Mark II showed excellent color accuracy overall. Hue accuracy was exceptional, with only small shifts relative to mathematically correct colors Average saturation was 105.3% (oversaturated by only 5.3%, mostly in the deep blues and reds, with just a little in some greens). Average "delta-C" color error was only 3.94 after correction for saturation, which is very low, and the best score of the group. (Hard to say without exhaustive checking, but this may very well be the best delta-C score we've ever seen.) All in all, an excellent color response for an SLR. Mouse over the links below the illustration above to compare results with competing models.
The Nikon D3X showed very good color accuracy overall. Hue accuracy was quite good, with only small shifts relative to mathematically correct colors Average saturation was 108.1% (oversaturated by 8.1%, mostly in the deep blues and reds, with just a little in some greens). Average "delta-C" color error was only 4.8 after correction for saturation, which is low, though not quite as good as the Canons in the group, but better than the D3's score. All in all, a very good color response for an SLR. Mouse over the links below the illustration above to compare results with competing models.
As you'd expect the Canon EOS-1D Mark IV showed very good color accuracy, as well as fairly accurate saturation levels. Hue accuracy was quite good, with small hue shifts occurring in the aqua, cyan, reds, oranges and yellow. Average "delta-C" color error was only 4.35 after correction for saturation, which is excellent; among the best we've tested. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Average saturation was 112.1% (12.1% oversaturated), a bit more vibrant than some professional SLRs (that seems to be the trend these days), but still very good. Mouse over the links below the illustration above to compare results with other professional models.
As expected, the Nikon D3S showed very good color accuracy, as well as fairly accurate saturation levels. Hue accuracy was quite good, with small hue shifts occurring in the cyans, reds, oranges and some greens and purples. Average "delta-C" color error was only 4.98 after correction for saturation, which is very good. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Average saturation was 111.6% (11.6% oversaturated), a bit more vibrant than some professional SLRs (that seems to be the trend these days), but still very good. Mouse over the links below the illustration above to compare results with other professional models.
The Nikon D700 showed good color accuracy, though like the D3, it had saturation levels slightly higher than we're accustomed to finding in professional SLRs, although most of the saturation boost was in blues, purples and reds. Other parts of the spectrum had essentially neutral saturation. Hue accuracy was quite good, with most of the hue shift occurring in the cyans and sky blues, with a little in the reds and oranges. Average saturation was 109% (oversaturated by 9%, as just mentioned, mostly in the blues, reds and a bit in the greens). Average "delta-C" color error was only 5.19 after correction for saturation, which is quite low, albeit very slightly higher than most of the competition. All in all, a very good color response for an SLR. Mouse over the links below the illustration above to compare results with competing models.
The Canon EOS 7D showed very good color accuracy, as well as fairly accurate saturation levels. Hue accuracy was quite good, with small hue shifts occurring mainly in the cyans, reds, oranges and some browns and purples. Average "delta-C" color error was only 4.81 after correction for saturation, which is very good. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Average saturation was 106.8% (6.8% oversaturated), which is also very good. Mouse over the links below the illustration above to compare results with competing models.
The Nikon D300S showed excellent color accuracy, as well as fairly accurate saturation levels. Hue accuracy was exceptionally good, with small hue shifts occurring in the reds, oranges and some greens and purples. The larger shifts in aqua and cyan are very common among the cameras we test; we think they're an effort to produce sky colors that look better on monitors and in print. Average "delta-C" color error was only 4.6 after correction for saturation, which is excellent. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Average saturation was 110.6% (10.6% oversaturated), a bit more vibrant than some semi-pro SLRs, but still very good. Mouse over the links below the illustration above to compare results with competing models.
As we've come to expect from Canon, the EOS 60D showed very good color accuracy, as well as fairly accurate saturation levels. Hue accuracy was much better than average, with small hue shifts occurring mainly in the cyans, reds, and oranges. Average "delta-C" color error was only 3.78 after correction for saturation, which is excellent, among the best we've tested. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Average saturation was 108% (8% oversaturated), which is also very good. Mouse over the links below the illustration above to compare results with competing models.
The Nikon D7000 showed pretty good color accuracy, with mild to moderate oversaturation of deep blues, bright reds, and dark greens, and to a lesser extent, some oranges, greens, purples and browns. Some colors such as yellow, light green, aqua and cyan are slightly understaturated. Hue accuracy was very good, with the typical (typical meaning significant) cyan shift we see in most cameras we test, and also a little shift in other colors such as aqua, red, orange and yellow. Average saturation for the Nikon D7000 was 107.3% (oversaturated by 7.3%) which is fairly typical. Average "delta-C" color error was 5.23 after correction for saturation, a little less accurate than the D90 and D300S, and the least accurate of the group above except for the Pentax K-5. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) All in all, a pretty good color response for an SLR. Mouse over the links below the illustration above to compare results with the others in this group.
As mentioned elsewhere in the review Sigma DP1 showed pretty good color accuracy, though its average saturation is quite a bit lower than that of its competition. Overall hue accuracy was very good, although small hue shifts occurred in many colors. Average saturation was 93.14% or 6.86% undersaturated (most cameras oversaturate somewhat) but average "delta-C" color error was 5.22 after correction for saturation, which is pretty good. (Delta-C is the same as the more commonly referred to delta-E, but delta-C takes into account only color differences, ignoring luminance variation.) Overall, a good (albeit somewhat muted) color response for a compact camera. Mouse over the links below the illustration above to compare results with other recent models.
While not part of our normal color-accuracy discussion, we feel we should mention a color issue that we observed in some of our test images. Particularly noticeable on our MULTI target shots, the white balance changes from the center of the target towards the corners, with a noticeable green cast appearing as you move from the center to the corners. Oddly, while still apparent, this effect was reduced in images processed into JPEGs from the DP1's X3F RAW-format files via Sigma's software. This looks like it might be a lens effect, but we seemed to see it more in some shots than others, even under identical lighting. (It was more apparent with our MULTI target than the Still Life, although it was still somewhat evident there as well.)
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