Re: [PRODIG] PS7 .jpeg resave

[Joe Stoner]

> 
>>>OK, try this test. Take an image save it as a JPEG using a low-medium
> setting. Copy this first version and keep it located in a separate
> folder. Now reopen and record an action that resaves the first  image
> using the same JPEG setting and closes the file. Keep reopening and
> applying the action - say, ten times or so. Now open the first version
> drag the 10x resaved JPEG image as a new, registered layer (hold down
> the shift key as you drag one window the other with the move tool) and
> then set the new layer to difference mode.<<
>
>>>In difference mode, any differences between one layer and the other
> will show up as image detail. If the difference is slight, you may have
> to add a major levels or curves adjustment layer to the top of the
> layer stack. Do the results surprise you?<<
>
> I've just tried this from PS6 and the results do surprise me! I can see not
> a single difference between the two images; the file sizes are identical
> too.
>
> This doesn't make sense to me, but I've tried the exercise twice and get the
> same result. Is this a bug in PS or is it supposed to happen (or have I
> screwed up the exercise?)
>
Hi Douglas

It should be the same as the JPEG setting (hi, med, low or whatever) refers
back to the original.
You are just performing the same process.
It's not like re-compressing an already compressed file.


ATB

Joe

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