Archived posting to the Leica Users Group, 2007/01/11
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]At 11/01/2007, you wrote: >It has been a long time since I read the tech articles on the dng >format. However, when I did (back when Adobe first announced it) I >seem to recall that they referred to the compression as "non-lossy." >I don't understand enough about the 1's and 0's to make a claim one >way or the other. But I've read about other compression schemes which >also claim non-lossy compression. > >Regards, >George Lottermoser >george@imagist.com Hi George! My understanding, from various people at Leica, is that the M8's compression is a lossless one. The DMR (essentially the same size sensor) delivers a 19.5mb file. The M8 delivers a compressed, 10.3mb file, if I recall correctly. That is about a 47% compression... close the limit of various lossless compression techniques. If it were a lossy compression, such as .jpg, it could drop the file to a meg or two, but with a great loss of information. Cheers! --- David Young, Logan Lake, CANADA Wildlife Photographs: http://www.telyt.com/ Personal Web-pages: http://www3.telus.net/~telyt