On Sat, 28 Mar 2009 15:50:23 -0700
[email protected] wrote:
| > convert -set 'option:deskew:auto-crop 10' scan9.pnm scan92.pnm
|
| Notice the option:deskew. This means it only works with the -deskew option.
| Also don't use the quotes. We'll fix the documentation.
|
| Programmically we auto crop by running a median filter across the image
| to eliminate salt-n-pepper noise. Next we get the image bounds of the
| median filter image with a fuzz factor (e.g. -fuzz 5%). Finally we
| crop the original image by the bounds. The code looks like this:
|
| median_image=MedianFilterImage(image,0.0,exception);
| geometry=GetImageBoundingBox(median_image,exception);
| print(" Auto-crop geometry:
%lux%lu%+ld%+ld",geometry.width,geometry.height,
| geometry.x,geometry.y);
| crop_image=CropImage(rotate_image,&geometry,exception);
A similar method to 'Trimming 'Noisy' Images' I developed to have trim
ignore small marks and concentrate on the more complex parts of an image.
Trimming 'Noisy' Images
http://www.imagemagick.org/Usage/crop/#trim_blur
Anthony Thyssen ( System Programmer ) <[email protected]>
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With some difficulity and a complete lack of experience,
Death was trying to wink. -- Terry Pratchet, "Mort"
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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