Archived posting to the Leica Users Group, 2014/07/02
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]Though a "DNG is both a raw image format and a format that supports "non-raw", or partly processed, images" Nothing Raw about a Tiff. A DNG can be converted to say a NEF which is the digital Nikon raw format. A thing I needed to do when I first got my D40X. They converted to full RAW. Not some half assed thing. On 7/2/14 5:16 PM, "Geoff Hopkinson" <hopsternew at gmail.com> wrote: > Howard a DNG is essentially a TIFF with some more instructions. > > > Cheers > Geoff > http://www.pbase.com/hoppyman > > > On 3 July 2014 06:41, Howard Ritter <hlritter at bex.net> wrote: > >> This file-size difference is intrinsic to TIFF, which interpolates a value >> for all 3 colors, R-G-B, for each pixel. >> >> The X-Pro 1 has a 24-Mpx sensor, 8 million for each of R, G, and B (this >> is simplified), each of which generates 1 byte of luminance information. >> So >> its raw (adjective, not acronym!) file size is 1 byte x 8 Mpx x 3 >> colors--to >> a first approximation, 24 MB. If JPEGed for storage, it is re-expanded >> when >> viewed. When the image is viewed or printed, software gives each R >> photosite also a G and a B value by interpolation from adjacent G and B >> photosites, and likewise for native G and B photosites. So the full image >> you see in Photoshop should have a file size of ~72MB. TIFF is simply this >> full file, with interpolated colors at each pixel. That's why it's always >> generally about 3 x the size of the stripped-down raw file. Differences >> seen in practice may result from compression, which can save significant >> storage capacity without loss of information (unlike JPEG). There may be >> some housekeeping stuff that brings your TIFF file to 4 x your raw; >> perhaps >> the file also incorporates a separate raw image. >> >> I don't know how this relates to DNG, though. >> >> --howard >> >> >> On Jul 2, 2014, at 1:58 PM, Ken Carney <kcarney1 at cox.net> wrote: >> >>> I hadn't really looked either. My X raw files are about 24-27 MB (not >> sure what causes the size differential), opening to 94MB Tiff's. My >> Canon >> 5D MkII files are roughly the same raw size, but open to 120+ MB Tiff's. >>> >>> Ken >> >> _______________________________________________ >> 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 -- Mark William Rabiner Photographer http://gallery.leica-users.org/v/lugalrabs/