VGX vs. PI Shading: Dithering

[Marc Andreessen]

In article <9105232209.AA01931 at snowhite.cis.uoguelph.ca> devans at SNOWHITE.CIS.UOGUELPH.CA writes:
>  It just hit me that the cause was the fact that PIs have only 24
>bitplanes.  So, when I used double buffering, I really got 12 planes
>per buffer.  Then the pipeline dithered to make the colours look OK.
>I have no idea how many planes the VGX has (I'd be interrested in
>knowning, though...), but I'm sure it would have 48....so it could
>do full 24-bit double-buffering.  That would explain the "soft" vs.
>"hard" look
>  This seems too simple...am I right in my assumption?

Yup... this is true on IBM RS/6000 24-bit boards also (12 bits/buffer 
with dithering).

Marc

-- 
Marc Andreessen___________University of Illinois Materials Research Laboratory
Internet: andreessen at uimrl7.mrl.uiuc.edu____________Bitnet: andreessen at uiucmrl