FWIW the following is from
http://www.jpg.com/products/wizard.html It
implies that normally you would introduce artifacts when
doing a mirror and re-saving, but I think is claiming that
with this technology you won't degrade the image at all.
Yes, this is what the jpegtran command-line
FWIW the following is from http://www.jpg.com/products/wizard.html It
implies that normally you would introduce artifacts when doing a mirror and
re-saving, but I think is claiming that with this technology you won't
degrade the image at all.
My guess is that it does have to clip to nearest 8
--- [EMAIL PROTECTED] wrote:
Re-encoding *unchanged* data at the same compression setting
gives
no additional loss.
It does give an additional loss. Nevertheless, the additional loss is
very small, much smaller then what you lose when you store a tiff image
with the highest jpeg quality in
.)
- David
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED]]On Behalf Of Robert Meier
Sent: Friday, February 08, 2002 9:31 PM
To: [EMAIL PROTECTED]
Subject: [filmscanners] Re: JPEG Lossless mirror?
--- Pat Cullinan, jr. [EMAIL PROTECTED] wrote:
I had been a believer
Robert Meier wrote:
--- Pat Cullinan, jr. [EMAIL PROTECTED] wrote:
I had been a believer in the proposition that multiple jpeg saves
would
degrade an image, but after reading a notice to the contrary in one
of the
trade mags, I did my own trials and now I save and resave jpegs which
--- [EMAIL PROTECTED] wrote:
I believe you are not correct, here. I have read in several accounts,
both
from people who have tried this experimentally and from people who
understand the theory of JPEG compression
Well, then it's probably because these people don't know how to do an
Just to follow this post up, I've found that the Independent JPEG Group
have developed a utility called 'jpegtran' which performs lossless
transformations on JPEG images. This webpage:
http://sylvana.net/jpegcrop/losslessapps.html
contains a very long list of the various apps which support
Mark Otway wrote:
This isn't so, Mark. While you're editing an image is PS,
no jpeg processing is performed. Your'e perfectly safe. The
jpeg processing occurs only when you save the image to a jpg
file, and even then virtually no further degradation takes
place, believe it or not
On Fri, 8 Feb 2002 08:54:22 - Mark Otway ([EMAIL PROTECTED]) wrote:
I know the encoding only takes place when the image is saved in PS (as
opposed to when it's manipulated). But since the act of re-encoding
results in some data loss, if I can perform these simple tranformations
(flip)
--- Pat Cullinan, jr. [EMAIL PROTECTED] wrote:
I had been a believer in the proposition that multiple jpeg saves
would
degrade an image, but after reading a notice to the contrary in one
of the
trade mags, I did my own trials and now I save and resave jpegs which
aren't even maximum
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