Splitting an image in half (into two images) from a script

From: B Thomas (thomasb_at_math.ohio-state.edu)
Date: 01/26/05 

Date: Wed, 26 Jan 2005 20:24:41 GMT

Hi,
How does one split an image into two images from a script. For instance
if we have a number of files that are scans of a journal containing
two pages. How does one split each scan into two images contianing one
page each. The method needs to be applicable to a length wise split
or a width wise split

The problem I have with using convert (from imagemagick) is specifying
image dimension in pixels . These are not going to be know if all this
has to be done in a bash script.

sincerely
B Thomas

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