Losslessly compressed DNG requires a very specific compression algorithm to meet the spec, and it is processor intensive. Adobe normally recommends manufacturers use the uncompressed format specification in cameras and such for best compatibility and to reduce in-camera hardware costs, improve write performance.
Godfrey On Mar 14, 2008, at 10:51 AM, Adam Maas wrote: > The PEF's are losslessly compressed, the in-camera DNG's are not. The > data inside, at least for the Bayer Matrix, is identical but the files > are not even close due to the compression. For some reason Pentax > doesn't support the Compressed version of the DNG spec. > > -Adam > > On 3/14/08, Tim Bray <[EMAIL PROTECTED]> wrote: >> One assumes the .PEF and the .DNG should be bit-for-bit identical, >> right? I note the .PEFs are all under 20M (13-18) while >> the .DNGs are >> all 23 or so. This is gonna add up after a while. -T >> >> >> On Fri, Mar 14, 2008 at 9:05 AM, <[EMAIL PROTECTED]> wrote: >>> Yep. I already downloaded it. Can't use it here at work unless I >>> get IT to install, but I'll put it on my photo box at home. I'll >>> have to have a go at shooting some PEF files and see what >>> happens. I don't think I'll gain anything other than file space. >>> ACR is doing nice conversions on the K20D DNG files. >>> -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
