On 04/22/2014 04:58 PM, Tobias Ellinghaus wrote: > Am Dienstag, 22. April 2014, 22:22:13 schrieb Wolfgang Mader: >> Hello list, > > Hi. > >> I see different file sizes roughly from 22Mb to 31Mb for the RAW files of my >> Mark III. The manual is explicit and states a file size of 27.1Mb. I would > > What manual states this? Canon's or darktable's? > >> have guessed that RAWs are always of the same size, since no compression is >> done. Can someone who has access to a 5D Mark III please comment on this? > > File sizes vary, the reason being that raw files DO use compression, it's > just > lossless. In the case of CR2 it's lossless JPEG IIRC.
Raw images are basically the data as it comes directly from the CCD detector in the camera. However raw files can also contain text information about the picture and conditions in the camera when the picture was taken. That might vary, but it should only be a few bytes of difference. Some might also contain a thumbnail of the image and that could vary in size. One that causes variations of nearly 10Mb seems strange though. Certainly the RAW files from my Fuji and GF-1 are, for each camera, the same size. Try running exif/exiftool or similar to find out what's "under the hood" between the two extremes. See also: http://lclevy.free.fr/cr2/ -- If voting could Change something, it would be illegal. -- Graffiti on a Montreal building ------------------------------------------------------------------------------ Start Your Social Network Today - Download eXo Platform Build your Enterprise Intranet with eXo Platform Software Java Based Open Source Intranet - Social, Extensible, Cloud Ready Get Started Now And Turn Your Intranet Into A Collaboration Platform http://p.sf.net/sfu/ExoPlatform _______________________________________________ Darktable-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/darktable-users
