[magick-users] rectangle -< 2 squares

[Anthony Thyssen]

Corrected replay --
Added +repage to remove virtual canvas info -crop leaves in image
for 'expert' use.


Al Bogner on  wrote...
| I use ImageMagick 6.4.0 04/14/08 Q16 (Suse Linux 10.3) and would like to do 
| the following:
| 
| 
| There is an image (rectangle) with a ratio of 2:1 in landscape format.
| 
| How can I split it in 2 squares?
| 
convert image.png  -crop 50%x100% +repage image_%d.png

This will spilt it into two 'tiles' and save the result as two files
image_0.png  and image_1.png

| IHow can I crop the rectangular to a square by cropping the left and right 
| side?
| 
If you are sure it is a 2:1 ratio rectangle.

convert image.png -gravity center  -crop 50%x100%+0+0 +repage image_center.png

The +0+0 turns of tiled crop.

| I can imagine to do this by calcualting the size, but is there an easier way?
| 
See IM Examples,   Cutting and Bordering
   http://imagemagick.org/Usage/crop/

Look at percentage crops, and tiled crops.
Better still look at all the examples given.

  Anthony Thyssen ( Graphics Enthusiast )    <A.Thyssen at griffith.edu.au>
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  At 300 dpi you can tell she's wearing a swimsuit.
  At 600 dpi you can tell it's wet.
  At 1200 dpi you can tell it's painted on.
  I suppose at 2400 dpi you can tell if the paint is giving her a rash.
                                                      -- Joshua R. Poulson
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         IM Examples               http://www.imagemagick.org/Usage/