Buzz Andersen
Cool app that replicates the elegant 1 bit image dithering routine Bill Atkinson used in HyperCard: http://john.tinrocket.com/hyperdither/ /ht @uliwitness
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@buzz@uliwitness Wow. All this time I'd just assumed it was Floyd-Steinberg dithering. Would love to know more about the algorithm!
Count Franken
Cabel Sasser
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@cabel@buzz@uliwitness "CIFilter: apply is unavailable" – custom kernels on iOS can be compiled but not applied to an image. Damn. - View other replies
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@chockenberry@cabel@buzz@uliwitness I just talked with Atkinson yesterday and told him his dithering is in the Accelerate framework. -
@wilshipley@cabel@buzz@uliwitness Somewhere in vImage to convert RGBA to indexed color? - View other replies
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@chockenberry@cabel@buzz@uliwitness kvImageConvert_DitherAtkinson - View other replies
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@wilshipley@cabel@buzz@uliwitness "Atkinson dithering is applied to the image, for the old timers." -
@chockenberry@wilshipley@cabel@buzz@uliwitness I was a little bit surprised that no one called it out when it went through API review. -
@chockenberry@wilshipley@cabel@buzz@uliwitness Sadly, error diffusion dithering is almost by definition unvectorizeable. - View other replies
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@stephentyrone@wilshipley@cabel@buzz@uliwitness Yep, about 15 minutes after creating Atkinson.cikernel I understood the problem :-) - Show more
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@cabel@buzz@uliwitness I've always loved the Moiré patterns caused by the error diffusion. Math never ceases to surprise the eye. -
@cabel@buzz@uliwitness Interesting that@billatk's approach of not propagating full error leads to more natural (serpentine) distribution.
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@cabel@buzz@uliwitness We all know how this is going to end up, too. By writing a Core Image kernel and feeding it the iOS video buffer. - Show more
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@cabel you might also like more advanced rendering such as this 19th century styling: http://www.mrl.nyu.edu/publications/illustrating-smooth/ …pic.twitter.com/04r6XsYihU
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@cabel@buzz@uliwitness And, of course, now I'm reading about halftone screens. TYVM https://en.wikipedia.org/wiki/Halftone -
@cabel@buzz@uliwitness I once implemented 8-bit compositing with transparency by masking using an ordered dither matrix. Good times! -
@buzz@cabel@chockenberry@uliwitness Love Hideout!
Wil Shipley
Frank A. Krueger
Buzz ebooks
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