Hi,

I am trying to achieve an ordered dithering effect for a render.
(digital halftoning,image quantizing)
I want to achieve an 1984 1985 look of CGA graphics card
like this Matlab trick :

http://www.mathworks.com/access/helpdesk_r13/help/toolbox/images/color7.html [mathworks.com]

I found a PS way to do it (using GIF export feature)
I also found a few algorithms to do it in Processing…

I was wondering if there is a way to do it in COPS or something inside houdini…

cheers!

J

JohnBardakos
Hi,

I am trying to achieve an ordered dithering effect for a render.
(digital halftoning,image quantizing)
I want to achieve an 1984 1985 look of CGA graphics card
like this Matlab trick :

http://www.mathworks.com/access/helpdesk_r13/help/toolbox/images/color7.html [mathworks.com]

I found a PS way to do it (using GIF export feature)
I also found a few algorithms to do it in Processing…

I was wondering if there is a way to do it in COPS or something inside houdini…

cheers!

J

I think there's a stand-alone program called “iquantize”. IIRC it does Floyd-Steinberg dithering (close to ordered).

I don't think there's a way to get at this through the interface (the quantize COP doesn't support dithering), but you could try something like:

% iquantize -n 4 Snail.pic dithered.pic


Increasing -n will give you a more accurate representation.

Thanks! this is ideal!

cheers!

J.