Although I haven't used it (some members have/do), PNG probably offers the
best compression in a "lossless" format--according to the chart that Bert
posted. Photoshop *does* offer that. Whether the format will be around in 20
years is another matter. :-)
Best regards--LRA
>From: RogerMillerPhoto@aol.com
>Reply-To: filmscanners@halftone.co.uk
>To: filmscanners@halftone.co.uk
>Subject: Re: filmscanners: (anti)compression?
>Date: Tue, 7 Aug 2001 16:45:24 EDT
>
>This is probably a stupid question, but how do you do an LZW compression on
>a
>TIFF file? Photoshop doesn't offer TIFF compression as an option, as far
>as
>I know. Is there freeware available? Since a lot of my work involves
>models
>against a solid colored background, it seems like lossless compression
>would
>save me a lot of storage space. I assume you have to run a stand alone
>decompression program to get the original file back.
>
>In a message dated 8/6/2001 7:03:48 PM Pacific Daylight Time,
>jimsnyder@insight.rr.com writes:
>
>
> > That is because LZW works by substituting colors with variables. If you
>have
> > an image with very few colors and shades, LZW will compact it to a tiny
> > fraction of its original self. On the other hand, a very diverse image
>with
> > lots of colors and shades will require tons of substitutions, and the
>size
> > becomes larger.
> >
>
>
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