blending layers changing response after flattening the layers

Posted By
Aug 7, 2004
I’m using Photoshop 7 to handle forensic examinations of documents, performing blending techniques to enhance variation in tonality, but after joining the layers for printing I receive a different response then when the layers are not combined. I find that the digital file becomes darker with more contrast then before the flattening. Any idea what I am missing?

Thanks for any comment that puts me in the right direction.

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Aug 7, 2004
One thing that comes to mind is grain.
If your pictures are grainy and you’re not viewing them at 100%, the monitor interpolates the best it can and the results of what you see are unpredictable.

Do a "command+0", than flatten to see the real effect.
Aug 7, 2004

Also make sure when flattening blend modes that you have a plain white background, and not transparency.

And as an alternative to flattening, try making an empty layer and copy-merging all existing layers into it. Sometimes (only sometimes) this yields are more faithful "flattened" rendition than the flatten layers command.

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