Archived posting to the Leica Users Group, 2011/12/30
[Author Prev] [Author Next] [Thread Prev] [Thread Next] [Author Index] [Topic Index] [Home] [Search]That's true of other kinds of compression like the LZW. Photos with lots of color and detail do not compress as much as simpler photos. Tina On Fri, Dec 30, 2011 at 4:10 PM, Jim Nichols <jhnichols at lighttube.net>wrote: > Herb, I can only offer an opinion. I suspect that the compression is > somewhat dependent on the content of the image, resulting in the variation > that you find in the size of the compressed files. > > Jim Nichols > Tullahoma, TN USA > ----- Original Message ----- From: "Herbert Kanner" <kanner at acm.org> > To: "Leica Users Group" <lug at leica-users.org> > Sent: Friday, December 30, 2011 3:00 PM > Subject: [Leica] DNG compression > > > > I'm probably flogging a dead horse, but there is one unanswered question. >> In view of the slgorithm that showed up in a forum: multiply the value >> that >> is between zero and 4096 by 16 and take the square root, thus mapping the >> 12-bit number into an 8-bit one, i.e. 0 to 256, how come uncondensed DNGs >> are all exactly 36.4 Mb, but the condensed ones have varying sizes? >> >> >> -- >> 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<http://leica-users.org/mailman/listinfo/lug>for >> more information >> >> >> > > > ______________________________**_________________ > Leica Users Group. > See > http://leica-users.org/**mailman/listinfo/lug<http://leica-users.org/mailman/listinfo/lug>for > more information > > -- Tina Manley, ASMP www.tinamanley.com