Path: utzoo!attcan!uunet!wuarchive!cs.utexas.edu!sun-barr!lll-winken!unixhub!shelby!neon!rfischer
From: rfischer@Neon.Stanford.EDU (Raymond C. Fischer)
Newsgroups: comp.sys.mac.programmer
Subject: Re: ColorQD vs QD32
Message-ID: <1990Oct24.195849.21546@Neon.Stanford.EDU>
Date: 24 Oct 90 19:58:49 GMT
References: <11285@hacgate.UUCP>
Organization: Computer Science Department, Stanford University
Lines: 31

In article <11285@hacgate.UUCP> hsieh@rscene.hac.com (Julia Hsieh) writes:
>How do I use 32 bit QuickDraw?  How is it different from Color QuickDraw
>which is documented in IM vol V?  I have an image file that contains
>10 bits of color that maps into 24 bits of rgb.  I can generate an internal
>lookup table, but can't figure out how to display it in 24 bits.
>
>Is 32 bit QD documented somewhere?
>
>There is probably a real easy answer, but I can't find it.  Any help
>would be greatly appreciated.

Wrong.  No easy answer.  Fortunately, not too difficult either.

32bit CQD is a superset of 8bit CQD.  The calls in IM-V still apply, but
now there are a few new ones and the old ones do more.  In general, the 
routines described in IM-V all take RGB colors already.  With 32bit CQD,
if the color can be displayed in 24-bit color (i.e., you have a 24-bit
color card) it will be.  Thus, all you have to do is set your monitor
to 24-bit color and display the image as usual.

This assumes you have 32bit CQD (Color QuickDraw) installed.  If you
have an SE/30, Mac II, IIx, or IIcx you'll need to put the 32-bit color
quickdraw file in your system folder and reboot.  The file has been available
on system software disks since 6.0.5.

Of course, I've glossed over a LOT of details.  32bit CQD is described 
in the first issue of Develop.  The official documentation is available
from APDA.

Ray Fischer
rfischer@cs.stanford.edu