Yes, the Canon RAW is compressed. I think Olympus ORF also has thumbnail
embedded, it display lightning fast with Infaview, don't know why it is slower
with Olympus viewer but it is not that bad, it displays very fast with my P4
3.2GHz machine.
C.H.Ling
> -------Original Message-------
> From: Wayne S <om4t@xxxxxxxx>
> Subject: [OM] Re: It's happened. I've relented.
> Sent: 14 Mar '06 13:47
>
> I think the Canon raw files are compressed with something like a Jpeg
> plus extra data added in. Hence with a viewer like FastStone, the
> Canon raw files load really fast, but the Olympus ORF files load really
> slowly in the viewer.
>
> Hence the best compression for ORF files would be a custom
> compression with a jpeg + extra data to achieve lossless compression.
> It is hard for most compression algorithms to do very well on binary
> data if there is no information about the data characteristics.
>
> Wayne
>
> At 06:53 AM 3/14/2006, you wrote:
> >I Know I know but I have to pursuade myself I don't need a 5D yet for
> >my wide angle lenses :-)
> >
> >actually whilst on this subject does anyone compress their oly raw files
> >for storage - I am just wondering how much of a pain it is to compress
> >and uncompress for the space gained.
>
>
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