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From: lsr@apple.UUCP
Newsgroups: comp.sys.mac
Subject: Re: Mac II
Message-ID: <509@apple.UUCP>
Date: Wed, 4-Mar-87 13:04:52 EST
Article-I.D.: apple.509
Posted: Wed Mar  4 13:04:52 1987
Date-Received: Fri, 6-Mar-87 07:09:34 EST
References: <10231@teknowledge-vaxc.ARPA> <1338@husc6.UUCP>
Reply-To: lsr@apple.UUCP (Larry Rosenstein)
Organization: Advanced Technology Group, Apple Computer
Lines: 34

In article <1338@husc6.UUCP> hadeishi@husc7.UUCP (Mitsuharu Hadeishi) writes:
>
>	As far as I know (haven't seen the spec sheets from Apple yet)
>the software of the color workstation will support up to a full 16-bits
>per R, G, B.  The software queries the display device by sending it
>a 16-bit RGB value (16-bits per R, G, and B) and getting back the
>"closest" value the display device can handle.  (I believe Apple
>likes to call color display devices "color monitors".  That is,
>the "color monitor" has extra logic to communicate with the host
>machine and tell it the closest 16-bit RGB value it can produce
>for a requested value.

I don't think there is any extra complexity in the monitor itself.  The
video cards, however, have to identify their characteristics (# bits per
pixel, for example).

The Apple video card, for example, supports up to 8 bits per pixel, so you
can get 256 colors at one time.  This is out of a palette of 16 million.
When you choose a color you specify a 48-bit RGB value (16 bits per
component).  The Color Manager will give you the closest color based on the
current lookup table.

I don't think there is any communication between the Color Manager
and the display device other than when the video driver in installed.

-- 
Larry Rosenstein

Object Specialist
Apple Computer

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