For version 0.80
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Allow user to specify command line options for imagemagick convert
routine. This way, we immediatley buy into the impreesive cabablities
of convert. (E.g. limit colors,filtering, blurring, sharpening, annotating
and so on....).

For version 0.90
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Check (fix?)  color stuff on 8-bit displays

For version 1.00
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Allow user to use user-defined image viewer. E.g. ee. Bug fixes?