Why do files from my Nikon D200 camera which are shot at 28MB come into Aperture at only 7MB?
Why do files from my Nikon D200 camera which are shot at 28MB come into Aperture at only 7MB?
I had these images in Large Fine JPG format at 28MB but when imorted and started working with them they are only & MB files in Aperture?
Léonie,
honestly speaking, I have done most of my image adjustments since 2006 (when I bought the D200) in various image processing applications (e.g. Capture One, Bibble 5 - now turned to AfterShot Pro by Corel, Lightroom at a friend's PC). I also tried Nikon's Capture NX but never liked it. Speaking of images that have been worth while keeping and working with as a RAW file I never saw any difference. As far as I can say with respect to Aperture 3 I come to the the same result as I did with the other software.
People may say that with the disk space being so cheap now it is not worth while thinking about that. But there is one other aspect that can be of advantage in certain situations: The compressed RAWs are transferred faster to and from the the card than the uncompressed files. Also, the time for decompression in applications seems to be shorter than that saved while reading the smaller files.
Before I started to use the compression feature (which in fact should be not lossless in the case of D200) I studied some reviews on that, of course.
Citing one of them one could say
"I tried to make duplicate shots to compare. I gave up. The mechanical exposure repeatability of my camera and nature itself aren't stable enough to let me make two captures close enough to see any possible difference between compressed and uncompressed raw.
People do see differences. They are seeing fluctuations in their technique shot-to-shot, not any differences due to the compression."
by Ken Rockwell
If you are interested, here is the original article by Ken Rockwell.
Another very elaborate investigation can be found here.
Again, a quote from the controversal discussion on that comparison:
"The ‘lossy’ NEF compression is really a clever use of information theory to save space by eliminating redundant raw levels. The noise which is unavoidably present in light effectively dithers tonal transitions so that the compression is *perceptually lossless*."
by a poster named emil
As far as I have read elsewhere, newer cameras as the D300 even have really "lossless" compression algorithms.
Cheers,
Michael
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