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?


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