10-27-2010, 08:24 AM
[quote name='PuxaVida' timestamp='1288163839' post='3809']
I don't say that the loss in IQ is proportional to compression ratio...It was just a remark... OTOH, I'm not sure that the "lossless compressed" NEF is 100% lossless. Most probably it's hard to see the difference in sRGB gamut even in a decent IPS monitor. But I believe that "uncompressed" is more lossless than the "lossless compressed".
[/quote]
I replied all the time without reading up the specs.
According to the D700 manual (p. 67 in the English version), this camera can write "uncompressed", "compressed", and "lossless compressed". The manual also tells something about the losses in image quality. There would really be no point in allowing for two options if both of them are lossy after all.
Nikon states that the lossless compression yields 20-40% reduction in file size. Try to apply some gzip, zip, 7-zip, or whatever you want to an uncompressed NEF and you will probably find that you can reduce file size by 20-40% or even more. You will agree that gzip or zip is lossless and that Nikon should be able to implement something similar in their cameras.
I don't say that the loss in IQ is proportional to compression ratio...It was just a remark... OTOH, I'm not sure that the "lossless compressed" NEF is 100% lossless. Most probably it's hard to see the difference in sRGB gamut even in a decent IPS monitor. But I believe that "uncompressed" is more lossless than the "lossless compressed".
[/quote]
I replied all the time without reading up the specs.
According to the D700 manual (p. 67 in the English version), this camera can write "uncompressed", "compressed", and "lossless compressed". The manual also tells something about the losses in image quality. There would really be no point in allowing for two options if both of them are lossy after all.
Nikon states that the lossless compression yields 20-40% reduction in file size. Try to apply some gzip, zip, 7-zip, or whatever you want to an uncompressed NEF and you will probably find that you can reduce file size by 20-40% or even more. You will agree that gzip or zip is lossless and that Nikon should be able to implement something similar in their cameras.