[magick-developers] about ImageMagick's dithering on a Hilbert-Peano curve

[duc.sequere.aut.de.via.decede at imagemagick.org]

>  Anyway, attached is a serpentine Floyd-Steinberg implementation.

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ImageMagick was originally based on a Floyd-Steinberg implementation
but in our testing we found the Hilbert curve method gave a more
visually pleasing result among a set of test images when we compared
the two methods.  Our testing method was to present a set of 25 images
side by side (one the original and one dithered with either Hilbert
or Floyd-Steinberg).  The Hilbert dithering was choosen a majority of
the time.  Its been about 10 years, so we will revisit the issue when
we receive your patch.