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20010627: Re: Gempak gif images

Lodovica Illari <address@hidden> asked:

> <Question>
> I would like to produce gemapk gif images with a white background instead
> of black.
> </Question>
 
Lodovica,

There are several ways to set the background color for the GF and XW drivers:

1) You can
 run "gpcolor" and set COLORS=101=white to set the background color
    number 101 to white (or any color).

2) If you are running ntl, so that the shared color map is installed,
   launch the "ncolor" application (GEMPAK 5.6) from ntl and
 click on the         first color box(#0) and configure the color.
 If you aren't running
   GEMPAK 5.6 which has ncolor, you can do the same thing with the
   ntrans color editor at the bottom of that application.

   If you are using "ntl" which installs the shared color map, then all
   programs will inherit the background color you set.


3) If you are not running ntl...typically, if you are generating GIF images
   to a virtual X display instead of a user console.... You can copy the
   $GEMTBL/colors/coltbl.xwp  (coltbl.xw prior to GEMPAK 5.6) to the
   local working directory and modify the file so that the first color entry
    is white instead of black, eg 

!Color name    Abrev   Red  Green   Blue  X color name
WHITE           WHI    255    255    255  white 




Steve Chiswell
Unidata User Support