--- "Jay D. Washington" <[EMAIL PROTECTED]> wrote:
> My apologies. I stand corrected. I have just tried it and the file
> size
> remained the same.
>
> I cannot remember where I first read this, but I accepted it as a
> fact
> without checking it.
The file size and quality should not change if you just open the file
and save it again, except for possible rounding errors which depends on
the implementation of jpeg. But then if the application is clever it
wouldn't even save the file as you haven't made any changes.
It's a complete different story, though when you do make changes to the
file and save it again. Then you lose quality after each step. That is
why it is a bad idea to use jpeg during processing of an image where
you make backup copies all the time.
The above problem is the reason why Photoshop does not make immediate
changes to a file when you save it in jpeg from say a psd file. In
other words, if you have open a psd file and then save it in jpeg you
won't see the jpeg artifacts but you will keep on working with the same
data as before you saved the file with jpeg. Even if you open the jpeg
file while the psd file is still open you just get a copy of what you
had before saving it as jpeg. To actually get the real jpeg file you
have to close the psd and jpeg file and then open the jpeg file again.
In that case of course you will lose quality if you make further
adjustments to the file.
Robert
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