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[filmscanners] Re: Archiving and when to sharpen (was:Color spaces for differentpurposes)



Date sent:              Sun, 09 Jun 2002 15:09:58 -0400
Send reply to:          filmscanners@halftone.co.uk
From:                   "Johnny Johnson" <jjohnso4@attbi.com>
To:                     doogle@doogle.com
Subject:                [filmscanners] Re: Archiving and when to sharpen 
(was:Color spaces for differentpurposes)

> At 01:20 PM 6/9/02 -0500, Laurie Solomon wrote:
>
> >Although I concur with all you have said, I have to wonder if the publicist
> >and publisher are requesting jpeg files rather than lwz compressed TIFF
> >files out of force of habit, lack of knowledgabout the ability to compress
> >TIFFs using the lwz compression which is as good if not better than the JPG
> >compression  at levels 10-12, or a lack of any real concern over quality of
> >the file they are getting.
>
> Hi Laurie,
>
> Is it not lzw compression instead of lwz?

yes

> In any case, does the amount of
> reduction in the file size using lzw compression vary considerably with the
> content?

yes; if there are many pixels of same color, image will compress more.

The reason I ask is that I just compared a scanned photograph of
> 3591 X 5472 pixel size saved in several formats.  The results were:
>
> TIFF                            36,498 kb
> TIFF with lwz compression       36, 523 kb
> JPG @ Photoshop level 12        17,633 kb

Wow, are you sure? The LZW TIFF was *larger*?
That's unusual.



           Mac McDougald -- DOOGLE DIGITAL
  500 Prestwick Ridge Way # 39 - Knoxville, TN 37919
 doogle@doogle.com  865-540-1308  http://www.doogle.com

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