Legacy ImageMagick Discussions Archive

I have a number of photos of people's drawings that have been taken by a research assistant. Unfortunately, this massive set of photos was taken in poor lighting, so there is some shadow. I am looking for a way to get rid of the shadow on all the photos. I have tried sharpening, using a mask, using fuzz, etc, but I am beginning to think there is no way to do it. Here is an example photo for reference, and the ideal (though admittedly improbable) result would be a plain white background with the line drawing as foreground. Any help would be appreciated.

try this (increase the blur from 5, if needed)

Unix syntax:
Windows syntax:
In the future, please identify your IM version and platform.

See
http://www.imagemagick.org/Usage/compose/#divide

A good result fmw42

Thanks so much, that worked perfectly fmw42. Sorry about the lack of info on my version and platform

I have on followup concern, but before I get to that,

I am on Windows 7 Professional 64 bit,
using ImageMagick-6.8.8-10-Q16-x64-dll

So, I would like to be able to do this same transformation for all the files in a given directory.
Unfortunately, 'mogrify' is apparently not compatible with -clone or -compose, and any time I attempt to use 'find', it says that it is not recognized as an internal or external command. Does anyone have any solutions?

Thanks,
Jeff

Nevermind, solved it.
Thanks anyways

jeff wrote:Nevermind, solved it.
Thanks anyways

What was your solution?

Warning to anyone intending to use, the way I have it coded will replace the original file with the new version. I also added the sharpen feature into the code provided by fmw42 because I wanted the lines of the image to be more pronounced once the shadow was removed.