RE: filmscanners: (anti)compression?

["LAURIE SOLOMON" <LAURIE@advancenet.net>]

Just to add something that might make your suggestion clearer.  After
selecting the "save as," one will be presented with the file format options
as Roger suggests.  It is only after you select the TIFF option for your
file format that the dialog box you are referring to appears.  You first
have to click on the Save as a TIFF file option before you get to see the
dialog box with the LWZ compression item.

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Maris V. Lidaka,
Sr.
Sent: Tuesday, August 07, 2001 6:55 PM
To: filmscanners@halftone.co.uk
Subject: Re: filmscanners: (anti)compression?


After the "Save-as" command in PS, you should get the attached screen giving
you the option of LZW compression.

Maris

----- Original Message -----
From: RogerMillerPhoto@aol.com
To: filmscanners@halftone.co.uk
Sent: Tuesday, August 07, 2001 4:44 PM
Subject: Re: filmscanners: (anti)compression?


Well, my Photoshop 6.0 (on a PC) doesn't offer any compressed TIFF file
formats.  When doing a "Save-as" for a 48-bit file, I was given three
choices:  TIFF(*.TIF), Ras(*.RAW), and Photoshop(*.PSD,*.PDD).  When saving
a
24-bit file, I have many more choices including GIF, JPEG, etc., but nothing
that implies a compressed TIFF.

In a message dated 8/7/2001 2:29:44 PM Pacific Daylight Time,
steve@gccl.fsbusiness.co.uk writes:



If you re-save a file PS will automatically save in the format that was
opened.

If you use "save as" and select TIFF you get the choice of compression
(none,LZW,JPEG,ZIP). Of these JPEG is lossy. None is the standard TIFF. The
other three are legal variations that may not be supported by software that
the person reading the file is using. Therefore unless otherwise told use
TIFF (no compression) or normal JPEG (not the TIFF variety) if you intend
someone else to read it.

Steve

----- Original Message -----
From: <RogerMillerPhoto@aol.com>
To: <filmscanners@halftone.co.uk>
Sent: Tuesday, August 07, 2001 9:45 PM
Subject: Re: filmscanners: (anti)compression?


> 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.
> >
>
>
>