Dither Black and White Image - Imaging Lingo

 

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This algorithm is similar to my posterize code, but it allows someone to dither a black and white, 1-bit image.

-- Dither Black and White Image -- ©2005 by Josh Chunick (josh@chunick.com) -- This code is free to use in commercial applications -- or however you want. If you use this code you -- must keep the comments, including this message, -- intact. Feel free to add any changes or make -- improvements. -- imageRef is the image object -- thePalette can be: systemwin, systemmac, rainbow, -- web216, metallic, pastels, vivid, ntsc -- theDither can be: true, false, 1215, 1969 on blackwhiteDither (imageRef, thePalette, theDither)   posterizedImage = image (imageRef.width, imageRef.height, 8, thePalette)   posterizedImage.copyPixels (imageRef, imageRef.rect, imageRef.rect, [#dither: theDither])   b_wImage = image (imageRef.width, imageRef.height, 1)   b_wImage.copyPixels (posterizedImage, imageRef.rect, imageRef.rect)   return b_wImage end