The real question is what to archive. You can always generate a DNG
from a PEF, you can't generate a PEF from a DNG, unless you embed the
PEF into the DNG, which nets no reduction in size.
Right now, I'm archiving PEF and working with DNGs. It might be
worthwhile to archive DNG with PEF enclosures, and take the hit on
space.
Godfrey
On Sep 24, 2005, at 7:54 AM, Shel Belinkoff wrote:
Perhaps a better way - certainly an alternative - is to convert
them to DNG
format, which, at least with the DS, results in a file about half
the size
of the original.
Shel
[Original Message]
From: Thibouille <[EMAIL PROTECTED]>
I wanted to know how a raw file would compress, specially since D
files are quite big (bigger than DS as you probably know). I tried a
couple formats. My point was to know how it would compress the best,
not taking speed into account !!
Of course size will vary with the software you use and with options
chosen.
Original PEF filesize: 14.222 KB
Zipped (maximum): 8.686 KB
RAR v2.5 (maximum): 8034 KB
ACE v2.6 (maximum): 8630 KB
7-zip (LZMA algorithm, 32MB dictionary size, 128bytes word size):
7308KB
Lastly, do not forget that compression formats not only do compress
but also do usually incorporate CRC and other ways of retreiving your
data if damage went to files.
If your PEF files or damaged, you're screwed.
So maybe it is a good idea to backup your PEF files somewhere
compressed?
