It was 16/11/04 2:36 pm, when michael shaffer wrote:

> I imagine you are correct.  I was thinking after, even if what I suggested
> might be true, Photoshop would have need be the writer of the original
> JPG(?)

Michael

I did a quick test by saving a PSD file as a JPEG at full quality, closing
it for good measure. Opening it, duping it, running Brian's script on it and
then saving it as a full quality JPEG. Closing again for good measure and
opening it. Shift-dragging it into the original JPEG and comparing. I found
values had changed by 1-3 levels, even though the file was saved by
Photoshop and at full quality both times.

If I saved another file in between the two JPEG saves, Photoshop showed the
JPEG Options dialog set to it's settings and not the settings used to save
the PSD as a JPEG, which, if the rumours were true, it should have shown for
you to accept.

Frankly, a change of 1 or 2 levels here and there among millions of pixels
is not going to be noticed on screen or show in print. You would have to
view the two files, I reckon, at something like 4-800% magnification in
Photoshop to see it, and then only if you toggle the visibility between the
two versions. And I seriously doubt if you could spot the difference by
using a loop on a print - unless you print it on clear acetate, superimpose
the two in pin register and view over a lightbox! <g>


Shangara Singh.
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