Re: [APML] PS-LZW compression?

["Bert Katzung" <katzung1@attbi.com>]

Hi Alan:
Don't use any form of compression until/unless you need to save for web
display, e-mail, etc, ie, make the file much smaller. *Always* save in a
non-lossy (ie, uncompressed) form. That means tiff or (for photoshop) psd
format.
When you ask "is there a good way to sharpen" do you mean something better
than what is described in the on-line tutorials/help files that come with
the programs? And for any Photoshop astro processing question, going direct
to Jerry Lodriguss' site will get you the most expert answer available for
astro work. I assume you've read up on what's already there in the Photoshop
help files (you do use the help files, right?<G>) and Jerry's site, so all I
can add is that for my astro processing,  unsharp masking is the only
technique I've used on color film or RGB-combined ccd images. If you're
ready for more involved stuff --- to be applied to luminance images--- then
deconvolution is an important option.
Hope this helps....
Bert

Bert Katzung
katzung1@attbi.com
www.astronomy-images.com

----- Original Message -----
From: "Alan Voetsch" <critter12952@yahoo.com>
To: "APML" <astro-photo@seds.org>
Sent: Saturday, December 07, 2002 10:48 PM
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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