Re: [Closed REQ 5293]:

["Daeron Meyer" <daeron>]

> 
> Date: Fri, 10 Mar 1995 11:47:09 -0600
> From: Craig Ludington <cludingt at chipsi.com>
> Message-Id: <9503101747.AA24549 at gatenode.chipsi.com>
> 
> 
> : X-Geomview currently supports only 24, 8, and 1 bit
> : 	deep displays.  No supported display depth was found.
> : 	Please mail the output of "xdpyinfo" to
> : 	software@geom.umn.edu
> 
> Thanks very much for Geomview!  I'm running it at home on a 486-33 Linux
> machine (have to get something much faster), and on a DEC
> OSF1 V2.1 250 alpha at work (well, I'm supposed to be working).
> 
> Craig Ludington
> 
> moe.chipsi.com is a DECpc 466d2 MTE running OS/2. Here is the output of 
> xdpyinfo:
> 
> ------------------------------ cut here ----------------------------
> 
> name of display:    moe.chipsi.com:0.0
> version number:    11.0

etc...

>   number of visuals:    1
>   default visual id:  0x20
>   visual:
>     visual id:    0x20
>     class:    StaticColor
>     depth:    8 planes
>     size of colormap:    256 entries
>     red, green, blue masks:    0x0, 0x0, 0x0
>     significant bits in color specification:    8 bits
> 
> 
> 

Hi Craig,

  Right, the problem with that particular X server is that the only visual
it provides is of class "STATIC". What does this mean? Well, mostly it
means that the X server has locked in a set of 256 colors (8 bits) and
there is no way for Geomview to change these colors. If you are going
to run Geomview, you will really need an 8 bit "pseudocolor" visual. This
would let Geomview allocate a smooth distribution of colors so that it
can properly dither from 24 -> 8 bit. Perhaps there is some way to
configure your particular X-server to provide a pseudocolor visual but
I can't guarantee it. Check out any docs you have on your version of X11 :-)

good luck,

daeron at geom.umn.edu
Daeron Meyer