RE: filmscanners: Encoding/compression Was:CD storage

["Laurie Solomon" <laurie@advancenet.net>]

An original 54MB PSD file was compressed to the following:
29.5MB with TIF (LWZ compression)
21.8MB with GF ("Lossless compresion)
 5.8MB with GF ("Virtually Lossless compression)

On the file I used to generate, I did not notice any significant differences
between any of the modes of compression - or for that matter between them
and the original.  I would speculate that differences between the two types
of GF compression may manifest themselves differently depending on the
nature of the original used.  I don't think the same would be the case
between the GF "lossless" and the TIF w/LWZ.  I do think that the
differences between both the GF "lossless" and the TIF w/LWZ, on the one
hand, and the original uncompressed file might also depend on the nature of
the original .PSD image.

Hope this helps.

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Robert Kehl
Sent: Thursday, February 01, 2001 12:43 PM
To: filmscanners@halftone.co.uk
Subject: Re: filmscanners: Encoding/compression Was:CD storage


Does anyone have any experience with using Genuine Fractals as a compression
tool?

How does it compare to TIF files with LWZ compression for 50mb image files?

How lossy/lossless is it?

Bob Kehl