Archived posting to the Leica Users Group, 2012/12/09
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]I had no idea I could set DNG compression levels in my M8. But then again, I have only had it 4 years, so I'm still learning ;-) Cheers, Nathan On 9 Dec 2012, at 21:23, Geoff Hopkinson wrote: > Herbert you have several items in there. > Firstly if you use compressed DNG set in camera you give up almost nothing > to gain the savings in file sizes. Some argue that you cannot see any > difference at all. While it is technically lossy, this does not mean the > change is significant and there is no futher loss on resaving, unlike where > you save new versionsa as new JPGs.. > Secondly on import in an Adobe raw processor (ACR or LR) truly LOSSLESS > compression is applied. In recent program versions that is the default (and > now only) process because there is no downside at all. > If you open previously uncompressed on import DNGs and do some editing, for > example a WB change that LOSSLESS compression is applied. > Thirdly , whether you originally shot with your camera set for compressed > or uncompressed DNGs, those files are further losslessly compressed by the > Adobe program on import (or first editing and saving for earlier program > versions). > > Cheers, > Geoff > http://www.pbase.com/hoppyman > > > > On 10 December 2012 06:39, Herbert Kanner <kanner at acm.org> wrote: > >> Hi LUGers, >> >> I'm looking for some enlightenment from anyone who knows. The question has >> to do with the size of Leica DNG files. Back in August, 2010, I had a set >> of DNGs all but one of which were 36.4 MB in size. All of those taken the >> same afternoon at the same general location. Similarly, using Leica's >> compression, in December, 2011, I found a set of DNGs taken the same day, >> at 18.3 MB. >> >> Then, in November, 2011, there was a set taken the same day, where the >> file sizes varied from 19.6 to 23.1 MB. Was this a result of a firmware >> update in which Leica probably introduced LOSSLESS compression? To round >> up >> the picture, I found a set in August, 2012, where the size range was 8.5 >> to >> 10.3 MB, undoubtedly where I set "compressed DNG" on the camera. >> >> >> >> Herbert Kanner >> kanner at acm.org >> 650-326-8204 >> >> Question authority and the authorities will question you. >> >> >> >> >> >> _______________________________________________ >> Leica Users Group. >> See http://leica-users.org/mailman/listinfo/lug for more information >> > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information > Nathan Wajsman Alicante, Spain http://www.frozenlight.eu http://www.greatpix.eu Books: http://www.blurb.com/bookstore/search?search=wajsman&x=0&y=0 PICTURE OF THE WEEK: http://www.fotocycle.dk/paws Image licensing: http://www.alamy.com/search-results.asp?qt=wajsman Blog: http://www.nathansmusings.eu/