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From: cflatter@zia.aoc.nrao.EDU (Chris Flatters)
Newsgroups: comp.windows.x
Subject: Re:  HELP with DECstation 5000/200 24bit color & XAllocColorCells
Message-ID: <9104100234.AA16796@zia.aoc.nrao.edu>
Date: 10 Apr 91 02:34:30 GMT
Sender: daemon@athena.mit.edu (Mr Background)
Organization: The Internet
Lines: 18

Matt Scott writes:
> So to try and track down the problem I did some digging and testing
> and discovered that the 24-bit machines do support a DirectColor visual
> (read/writeable), however, it is NOT the default visual!  Does
> XAllocColorCells only try the default visual?

XAllocColorCells will only try the colormap you specify as its second
argument.  If you want to use a non-default visual you must create a
private colormap using XCreateColormap with a pointer to the visual
you want to use. 

> How can we change the default visual from a read only to the
> read/write visual?

Some X servers will allow you to change the default visual at start-up.
I don't know if DEC's is one of them: check the man page.

Chris Flatters