SOLVED**Removing shadow

[jeff]

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.

[fmw42]

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

Unix syntax:

Code: Select all

convert 255q24i.jpg \( -clone 0 -blur 0x5 \) +swap -compose divide -composite result.png

Windows syntax:

Code: Select all

convert 255q24i.jpg ( -clone 0 -blur 0x5 ) +swap -compose divide -composite result.png

In the future, please identify your IM version and platform.

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

[Bonzo]

A good result fmw42

[jeff]

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

[jeff]

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

[jeff]

Nevermind, solved it.
Thanks anyways

[fmw42]

Nevermind, solved it.
Thanks anyways

What was your solution?

[jeff]

Code: Select all

for %a in (*.jpg) do convert %a ( -clone 0 -blur 0x5 ) +swap -compose divide -composite -sharpen 0x5 %a

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.