Antoine on wrote...
| Hi,
| I am trying to detect whether a pdf page has non b&w elements in it -
| does anyone have any ideas on how I might do this with imagemagick
| (and ghostscript).
| Cheers
| Antoine
|
This is the first step discussed in my 'Comparing Images' IM Examples
reference.
Determining the Type of an Image
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/compare/#imagetype
It is short of actual examples, but had lots of ideas.
In your specific case..
compare the image against its grey scaled version
If the image differs quite a bit, then the image contains non-grey
elements.
For non B&W elements, try comparing the image thresholded
with a low value, verses and image threholded against a large value.
Any areas of non B&W will show up in the comparision of the threholded
images.
Any examples you develop would be apprecieted too.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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