libpipi

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sam 25cdf35a86 * jajuni.c: add Jarvis-Judice-Ninke dithering. It's a Floyd-Steinberg-like error diffusion method that has fewer high resolution structural artifacts at the expense of resolution. git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2700 92316355-f0b4-4df1-b90c-862c8a59935f		vor 16 Jahren
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dbs.c	* dbs.c: generate the initial halftone using random dithering instead of	vor 16 Jahren
floydsteinberg.c	* floydsteinberg.c: minor optimisation in the FStein error propagation.	vor 16 Jahren
jajuni.c	* jajuni.c: add Jarvis-Judice-Ninke dithering. It's a Floyd-Steinberg-like	vor 16 Jahren
ordered.c	* pipi_dither_ordered() now takes two arguments; any image can be used as	vor 16 Jahren
ostromoukhov.c	* Dithering algorithms no longer modify the original image.	vor 16 Jahren
random.c	* random.c: implement random dithering using a deterministic pseudo-RNG.	vor 16 Jahren