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19990525: Gempak x-windows problem

This archive contains answers to questions sent to Unidata support through mid-2025. Note that the archive is no longer being updated. We provide the archive for reference; many of the answers presented here remain technically correct, even if somewhat outdated. For the most up-to-date information on the use of NSF Unidata software and data services, please consult the Software Documentation first.

  • Subject: 19990525: Gempak x-windows problem
  • Date: Tue, 25 May 1999 12:27:48 -0600

Tom,

Gempak requires the default visual of your display to be 8 bit
pseudocolor. If you are running your default visual in 24 bit mode,
then you will have to correct that. Use the xdpyinfo program
to check your default visual.

If you are running with the default visual in 8 bit mode but
still have trouble allocating colors, make sure that any
color intensive applications such as a web browser aren't running,
and use the "ntl" launcher in Gempak to obtain a shared colormap
within Gempak. When using ntl, it will alert you if you
do not have enough colors available on your system. You can decrease the
number of colors used by satellites for instance by using "ntl -s 64"
for eaxample to use 64 colors for satellites rather than the default 128.

Steve Chiswell
Unidata User Support


> 
> 
> -----Original Message-----
> From: Tom Szymkiewicz [mailto:address@hidden] 
> Sent: Tuesday, May 25, 1999 11:13 AM
> Subject: Gempak x-windows problem
> 
> 
> Hello,
> I hope I'm writing this to the right person.  If not, I would appreciate it
> if you could forward this message to someone who could answer my question.
> Thank you very much.
> 
> After installing Gempak on our workstation (SunOS 5.6) I ran into a problem
> of allocating colors:
> 
> [GEMPLT -46] NCLRAL - Can not allocate read/write colors.
> 
> If you could tell me where to look for the solution I would be very happy!
> Thank you in advance.
> 
> Tom, summer EPA student.
>