🚀 go-pugleaf

In article <2801@gryphon.CTS.COM> (Richard Sexton) writes:
> I've been using this tip to acheive what looks for all the world
> like 32 gray scales.
> Now, to get the additional 16 shades of gray, dither 1:1 between
> every n'th color and it's n+1'th counterpart. Use the following pattern:

I like it, but like you said, trying to get the gist of the pattern
was a bit tough. Do you do region dithering or pixel dithering?

Pixel dithering is using pixels that are actually 2 X 2 blocks of the
form 
	+-----+-----+
	|  n  | n+1 |
	+-----+-----+
	| n+1 |  n  |
	+-----+-----+
	
And 'region' dithering simply applys a pattern fill of the above pattern
to "regions" of a given grey scale. 

In the pixel techinique you get a effective 320 X 200 X 5 greyscale image
in a 640 X 400 screen. Sounds like a mode I should ad to my image processing
stuff.

--Chuck McManis
uucp: {anywhere}!sun!cmcmanis   BIX: cmcmanis  ARPAnet: cmcmanis@sun.com
These opinions are my own and no one elses, but you knew that didn't you.