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List:       imagemagick-user
Subject:    Re: [magick-users] Converting images with padding or cropping based
From:       Anthony Thyssen <anthony () griffith ! edu ! au>
Date:       2007-09-24 2:19:24
Message-ID: 200709240219.l8O2JOgw025612 () wraith ! itc ! griffith ! edu ! au
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Tuxedo on  wrote...
| I have a simple shell procedure that batch converts original jpeg's in 
| various sizes into thumbnail copies maximum 75 pixels in height:
|
| for i in *.jpg
| do convert -quality 70 -geometry x75 $i ../img/`basename $i .jpg`.jpg;
| done
|
| I'd like it that when a resulting thumb becomes less than 100 pixels 
| wide to add padding on left and right in some solid color, making the 
| jpeg including the solid area exactly 100 pixels wide.
|
| If however a resulting thumb becomes wider than 100 pixels, I would 
| then then like it cropped on the left and right edges so it becomes 
| exactly 100 pixels wide.
|
| This is as if placing the resulting 75 pixes tall image in the center 
| of a canvas which is exactly 100x75 pixels, and cropping the resulting 
| thumb only if necessary.
|
| Exactly how can this be done? Which Image Magick methods and tools are 
| suitable for this? Any examples would be greatly appreciated.
|
See IM Examples, Thumbnails, Padding Out Images...
   http://www.imagemagick.org/Usage/thumbnails/#pad

It gives about 4 different techniques in various ways, depending on your
version on IM.


  Anthony Thyssen ( System Programmer )    <A.Thyssen@griffith.edu.au>
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     Anthony's Home is his Castle     http://www.cit.gu.edu.au/~anthony/
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