imagick
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Dithering doesn't appear to be working.
http://local.phpimagick.com/Imagick/quantizeImage?measure_error=Enabled&colorspace=RGB&number_colors=64&tree_depth=8&dither=Floyd%E2%80%93Steinberg&image_path=Lorikeet
Because the param is being parsed as a bool....
IM6 - MagickPosterizeImage(MagickWand *,const size_t,const MagickBooleanType), IM7 - MagickPosterizeImage(MagickWand *,const size_t,const DitherMethod),
IM6 - MagickQuantizeImages(MagickWand *,const size_t,const ColorspaceType, const size_t,const MagickBooleanType,const MagickBooleanType), IM7 - MagickQuantizeImage(MagickWand *,const size_t,const ColorspaceType, const size_t,const DitherMethod,const MagickBooleanType),