merging imread and imwrite

[John W. Eaton]

On  1-Feb-2008, Michael Goffioul wrote:

| Given the common origin of ImageMagick and GraphicsMagick, I'm
| alwo wondering if the code could be made compilable with one or
| the other?

If the functions we need from Magick++ have the same signature, then I
don't see why not.  But I don't want to have to do a lot of work to
adapt to multiple interfaces, so it is also fine with me if we simply
require the Magick++ library from the GraphicsMagick package.

jwe