You could just draw the rectange with a 50% transparent white.
Current that is specified as -fill '#FFFFFF80'
For an example see Annotation Images, Label Overlays...
http://www.cit.gu.edu.au/~anthony/graph ... /#label_on
Their is a request however to allow something like a white_50%
specification for colors, or at least something along those lines, but it
is still under discussion.
Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".
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