Post Scriptum:
For anyone with deeper interest, I would suggest reading the following
article on different strategies for grayscale conversion:
http://www.fho-emden.de/~hoffmann/gray10012001.pdf
Especially the Photoshop result is drastically different from that of
other formulae. Perhaps IM should allow to choose between different
luminance models when converting to grayscale.
Of course, you can implement any algorithm by the fx operator but that
would be rather slow for batch processing a bulk of images.
Wolfgang Hugemann
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