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RE: filmscanners: File format

>Each time there would be some generational loss.

Not necessarily true. If you open and close ( or resave) the compressed file
without changing the compression from one quality level to another in the
case of .jog or without resampling the image prior to closing or resaving
the file, there will be no more degradation than opening and closing or
resaving a raw uncompressed file.

When you open a compressed file you have uncompressed it, so resaving it
with the same compression as before or without engaging in any resampling
prior to resaving the file  should not result in any additional losses in
data or quality.

-----Original Message-----
From: owner-filmscanners@halftone.co.uk
[mailto:owner-filmscanners@halftone.co.uk]On Behalf Of Larry Berman
Sent: Thursday, March 29, 2001 8:31 PM
To: filmscanners@halftone.co.uk
Subject: Re: filmscanners: File format

What would be the point of storing and reopening and saving the same image
in a compressed format repeatedly. Each time there would be some
generational loss. Store in an uncompressed native format to your graphics
program. If you open a jpeg in Photoshop it automatically takes on the
characteristics of a PSD. That's why you should save it as a PSD prior to
working on it. Then use Photoshop's "Save for the Web" to create your
compressed jpeg.


>Did any one knows whether is there any informations/details loses when
>store in compressed JPG format in maximum quality 10 and while you keep
>opening and saving the same file many times?
>And how about the raw file TIFF?

Larry Berman




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