Path: utzoo!utgpu!water!watmath!clyde!bellcore!faline!thumper!ulysses!andante!mit-eddie!ll-xn!ames!amdahl!apple!lsr
From: lsr@apple.UUCP
Newsgroups: comp.sys.amiga.tech
Subject: Re: Color QuickDraw
Message-ID: <9708@apple.Apple.Com>
Date: 12 May 88 19:20:00 GMT
References: <4607@super.upenn.edu> <4WWCvzy00VoDA-hXlh@andrew.cmu.edu>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 27
Posted: Thu May 12 15:20:00 1988

In article <4WWCvzy00VoDA-hXlh@andrew.cmu.edu> mp1u+@andrew.cmu.edu (Michael Portuesi) writes:
>
>Color QuickDraw has support for more than eight colors.  A recent
>color board for the Mac SE supports 16 out of 4096 colors (sound
>familiar?)  and uses Color QuickDraw.  I am not exactly sure what the
>capabilities of Color QuickDraw are; time to go seek out one of my
>MacFriends.

The card for the Mac SE does display something like 16 colors out of 4096,
but this is not using Color Quickdraw.

Color Quickdraw represents colors as 48-bit RGB values, and CQD picks the
closest color that the display can generate.  Currently, CQD works with upto
8 bits per pixel, giving 256 colors out of a palette of 16 million.  There
are 3rd party cards that display all 16 million colors at once.  These are
implemented as 3 8-bit planes, and CQD is made to draw into the planes
separately.  Apple is working on direct support for 24 bits per pixel in
CQD.




-- 
		 Larry Rosenstein,  Object Specialist
 Apple Computer, Inc.  20525 Mariani Ave, MS 27-AJ  Cupertino, CA 95014
	    AppleLink:Rosenstein1    domain:lsr@Apple.COM
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