Re: [PRODIG] PS7 .jpeg resave

[Martin Evening]

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?

Martin Evening Photography <www.martinevening.com>
Co-listowner ProDIG discussion list <http://www.prodig.org>

Author of Adobe Photoshop 7.0 for Photographers
<www.photoshopforphotographers.com>

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