12bits filter plugin for Photoshop
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Copyright 2004-6 Toby Thain <toby@telegraphics.com.au>.

This code is provided as an example of a simple cross-platform filter plugin,
which can be used as a template to start other projects.

What it does
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This filter was developed due to a specific request on comp.graphics.apps.photoshop 
( http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&selm=3e033126%241%40news.opusinteractive.net )

It merely quantises each channel of an image, rounding input values to nearest 
of the 16 possible output values (0,17,34,51,68,85,102,119,136,153,170,187,204,221,238,255).

A version that does a simple quantisation is included, as well as a separate version
that does Floyd-Steinberg (error diffusion) dithering to smooth the result.

Please contact the author with any bug reports, suggestions or comments.
The latest version is always available from http://www.telegraphics.com.au/sw/