[magick-users] Image Magic (convert)

[Anthony Thyssen]

Rebecca York on  wrote...
| Hiya,
| 
| I'm having problems with image magic (convert.exe)
| 
| convert.exe c:\foo.jpg -filter Lanczos -resize 640x480! -sharpen 1x0.75
| -blur 1x0.3 -quality 76 -strip -sampling-factor 2x2 -compress JPEG
| c:\foo2.jpg
| 
| This works fine on valid jpg images, resizes them nicely;
| 
| The problem occurs when the image isn't a valid jpg file, convert.exe
| returns but keeps the process running, and when a certain number of
| convert.exe processes are running (we've counted 100s of them at some
| points) it stops resizing any images at all. (the images are actually on a
| UNC share not c:\)
| 
| To get around this I want to put in a script to quickly go through the
| images and automatically discard invalid images - is there any quick way of
| checking whether a jpg is valid or not?
| 
| These are uploaded by clients and they put in loads of junk
| 
| Thanks.

Add -regard-warings

See http://www.imagemagick.org/Usage/basics/#controls

That aborts when image is corrupt for Im to follow
and it returns an appropriate exit value.  identify can be used with
that option for quick checks.

  Anthony Thyssen ( System Programmer )    <A.Thyssen at griffith.edu.au>
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  Geordi: Data! What Happened?
  Data:   Any answer would be mere speculation.
          This is another example of how our actions have random results.
                                --- Star Trek New Generation, ``Contagion''
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/