Archived posting to the Leica Users Group, 2013/10/27
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]An issue of LFI some years ago described the exact algorithm used for this DNG compression and arguments for it being, for all practical purposes, not detectable in final picture appearance. I'll dig the article up sometime next week and post the algorithm and possibly the argument in its favor. Since I consider my SD card to have infinite storage, and ditto for my negative backup medium, I decided not to compress. Herbert Kanner kanner at acm.org 650-326-8204 Question authority and the authorities will question you. On Oct 27, 2013, at 7:45 AM, Brian Reid <reid at mejac.palo-alto.ca.us> wrote: > This weekend I learned, the hard way, that if you ask an M9 to produce > compressed DNG files it only keeps 8 bits per pixel. If you want the full > 14 bits per pixel that the sensor records you have to store uncompressed > DNG. > > I didn't read the documentation as closely as i should have. Not that the > documentation is explicit about this. On page 174 of the English-language > manual it says that DNG compression is achieved "by non?linear reduction > of color depth". > > Foo. Next time I'll get this right. > > > > _______________________________________________ > Leica Users Group. > See http://leica-users.org/mailman/listinfo/lug for more information >