Re: [APML] PS-LZW compression?

["Franklin A. Holub" <lists@my-spot.com>]

Alan,

LZW is a lossless form of compression - that is you can use it without any
degradation to the image. It is same family of compression as PKZIP. On a
typical astro image, it will save 5% - 20%. In this day of 120 Gig
harddrives, I only save tiffs uncompressed, mainly because they load faster.
Also some imaging software will not read tiffs stored with compression... A
few years ago I put together a page showing the differences between lossless
and lossey file formats for webpages. Its not aimed at astrophotos but the
ideas still apply...

http://www.my-spot.com/tips.htm

Frank
http://www.my-spot.com

----- Original Message -----
From: "Alan Voetsch" <critter12952@yahoo.com>
To: "APML" <astro-photo@seds.org>
Sent: Sunday, December 08, 2002 1:48 AM
Subject: [APML] PS-LZW compression?


> I spent many hours working on compositing and other
> fun things today. As I was closing the file in PS as a
> tiff, a box came up and asked if I wanted to use 'LZW
> Compression'. My brother advised yes, but he does web
> pages not AP. Any thoughts on LZW?
>
> One other thing. Is there a good way to sharpen
> images, either in PS or PWP?
>
> Thanks,
> Alan
>
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