Re: JPEG's
Re: JPEG's
- Subject: Re: JPEG's
- From: Chris Murphy <email@hidden>
- Date: Wed, 3 Jul 2002 00:01:48 -0600
email@hidden (Anthony Sanna) writes:
>
I read in one of the posts that it's best to save digital camera files as
>
"raw" and not .jpg, because every time the file is resaved as a .jpg,
>
more information is lost. I don't have a digital camera, but began
>
wondering about multiple .jpg saves. Is .jpg max-quality 12 lossless, or
>
will multiple saves at 12 still result in image degradation?
Max quality isn't lossless. For that you need the JPEG2000 plug-in for
Photoshop (works in OS X BTW). I tried saving an image with max quality,
closing it, opening the JPEG, resaving as quality 12, closing it -etc 20
times and the file size stayed either exactly the same or really close to
exactly the same and I saw no difference between the files at 200%. This
was a while ago (months or years, what's the difference). I think where
you will see rapid artifacting is at the lower quality factors.
Chris Murphy
Color Remedies (tm)
Boulder, CO
303-415-9932
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