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1

Great trick!

This really is a great trick! I just used it on a dark b&w photo and it significantly improved the image.

2

Great!

Thanks for the tut... I saw it in MacWorld Oct. 2003. I use Photoshop regularly in my business but somehow had not heard of this procedure. Though it seems somewhat similar to noise reduction via use of the blue channel.

3

lighten harsh shadows

I read this article in MacWorld magazine. I followed the steps in the article but ran into a problem when I was unable to invert the image or channel as described in step 4.
Invert was greyed out... so I am stuck. Please tell me what I am missing. I tried several times.

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