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Nikon D3 and D300 NEF raw files now supported by Dave Coffin'sdcraw
I just discovered that yesterday Dave Coffin released
version 8.79 of dcraw.c, which among a number of other updates includes code to handle Nikon's soon to arrive D300 and D3 model DSLR's (announced for release in November, and apparently rumored to be available on or about the 27th). http://www.cybercom.net/~dcoffin/dcraw/dcraw.c It is safe to say that UFRAW, the graphical interface that uses dcraw.c code and provides a plugin for The GIMP, will soon have an upgrade to include the new dcraw code, and will also likely be available before the actual cameras are on the shelf. http://ufraw.sourceforge.net/ -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) |
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Nikon D3 and D300 NEF raw files now supported by Dave Coffin'sdcraw
Floyd L. Davidson wrote:
I just discovered that yesterday Dave Coffin released version 8.79 of dcraw.c, which among a number of other updates includes code to handle Nikon's soon to arrive D300 and D3 model DSLR's I'll be interested in hearing some more objective evaluations of the noise performance on these models, perhaps. (announced for release in November, and apparently rumored to be available on or about the 27th). http://www.cybercom.net/~dcoffin/dcraw/dcraw.c It is safe to say that UFRAW, the graphical interface that uses dcraw.c code and provides a plugin for The GIMP, will soon have an upgrade to include the new dcraw code, and will also likely be available before the actual cameras are on the shelf. http://ufraw.sourceforge.net/ |
#3
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Nikon D3 and D300 NEF raw files now supported by Dave Coffin'sdcraw
Paul Furman wrote:
Floyd L. Davidson wrote: I just discovered that yesterday Dave Coffin released version 8.79 of dcraw.c, which among a number of other updates includes code to handle Nikon's soon to arrive D300 and D3 model DSLR's I'll be interested in hearing some more objective evaluations of the noise performance on these models, perhaps. I tried it with some NEF files I downloaded from one of the demos a few weeks ago, and found the results quite interesting. It's mighty hard to adjust things precisely using a command line utility, but I did get fairly close output from dcraw compared to what the embedded JPEG image was. The surprizing thing was that the noise on ISO 25600 images was better from dcraw. At ISO 6400 it was about the same. It will have to wait until UFRAW upgrades for it to be easy enough to really experiment much. -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) |
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Nikon D3 and D300 NEF raw files now supported by Dave Coffin's dcraw
On Nov 5, 10:45 pm, (Floyd L. Davidson) wrote:
Paul Furman wrote: Floyd L. Davidson wrote: I just discovered that yesterday Dave Coffin released version 8.79 of dcraw.c, which among a number of other updates includes code to handle Nikon's soon to arrive D300 and D3 model DSLR's I'll be interested in hearing some more objective evaluations of the noise performance on these models, perhaps. I tried it with some NEF files I downloaded from one of the demos a few weeks ago, and found the results quite interesting. It's mighty hard to adjust things precisely using a command line utility, but I did get fairly close output from dcraw compared to what the embedded JPEG image was. The surprizing thing was that the noise on ISO 25600 images was better from dcraw. At ISO 6400 it was about the same. It will have to wait until UFRAW upgrades for it to be easy enough to really experiment much. -- Floyd L. Davidson http://www.apaflo.com/floyd_davidson Ukpeagvik (Barrow, Alaska) UFRAW is pretty cool. Between UFRAW and The GIMP you can do an awful lot with your Nikon DSLR and Free Software. |
#6
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Nikon D3 and D300 NEF raw files now supported by Dave Coffin's dcraw
I've made a preliminary analysis of the Nikon D3's dynamic range, using the Nikon D3 raw samples posted he http://aaronlinsdau.com/gear/articles/d3.html The latest build of the raw converter dcraw can indeed understand D3 raw files though it seems there are some bugs with some of the conversion options, the -D option doesn't seem to work; but I was able to get a linear 16-bit conversion without bayer interpolation that I could analyze. I should stress that it is important to take the raw converter out of the equation as much as possible or else you are testing the raw conversion software as much as the camera. The linear conversion w/o bayer interpolation does that; to be specific the options used were dcraw -v -h -4 -T -k 0 -H 1 -o 0 -r 1 1 1 1 filename.nef Looking at the ISO 200 sample, I analyzed a few regions of the image in the red and blue channels, measured the noise in IRIS and extrapolated the result to vanishing luminance. The dynamic range seems to be about 11.7 stops (read noise is about 4.9 in 14-bit raw levels, and the highlights clip at 16383 in those units). I had to extrapolate down to zero raw level from a bit above since Nikon clips their blackpoint and so the noise is not a Gaussian distribution but a half-gaussian at the bottom end, and fluctuations are thereby clipped as well; using the absolute lowest exposure levels underestimates the noise. This is a *very* rough, preliminary measurement. A proper measurement would use a blackframe image, shot at a high shutter speed with a lens cap on the body. That will take a lot of sloppiness out of the above analysis, but I would be surprised if the dynamic range is more than 12 stops. A similar analysis at ISO 1600 yields about 10 stops DR. Thus it would appear that the D3's dynamic range is about the same as Canon 1 series DSLR's. Unfortunately the sample images are not appropriate for determining the quantum efficiency of the sensor, which to my thinking is one of the determining factors in high ISO performance. The raw was shot in 12bit mode rather than 14-bit mode (all raw levels were multiples of four in 14-bit units). It will be interesting to see whether an image shot in 14-bit mode has more dynamic range, since the 12-bit sample here has a quantization step which just about equals the noise. Theoretically that could get you a very tiny fraction of a stop more, but I don't think quantization error is the limiting factor here. Anyway, DR appears to roughly equal the Canon Mark 3 at ISO 200. BTW, pattern noise (banding) seems fairly well controlled (though visible in the deepest shadows if you boost them enough). |
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