20001101: changing background color for gif2 device in GEMPAK 5.6

David,

The background color is defined from the first color index of the installed
color table, however, you can create a gifw device that hardcodes white 
as the background color. In hscrgb.f, set the color 101 being passed as
values of 255:

        IF ( icolr .eq. 101 ) THEN
c           CALL WBCOLR ( ired, igreen, iblue, iret )
            ibg_red = 255
            ibg_green = 255
            ibg_blue = 255
            CALL WBCOLR ( ibg_red, ibg_green, ibg_blue, iret )
        ELSE
            icred  ( icolr ) = ired
            icgrn  ( icolr ) = igreen
            icblue ( icolr ) = iblue
            CALL  WSCOLR ( ired, igreen, iblue, iret )
        END IF

If you create a separate driver, just copy the $GEMPAK/source/driver/active/gif2
directory to gifw, then edit the makefile and change the PROG and ALIB names
to gifw and gifw.a respectively.

Steve Chiswell
Unidata User Support



>From: David Ovens <address@hidden>
>Organization: UCAR/Unidata
>Keywords: 200011012256.eA1MuV428259

>Hello,
>
>I've been experimenting with the gif2 device in gdplot for GEMPAK
>5.6.  Note that this is not mentioned in the online User's Guide, but
>I did find it mentioned in the online Tutorial.
>
>I've tried running gpcolor before or after gdplot to change the
>background color (and any other color), but it doesn't work -- none of
>the colors change.  If necessary, I'd be willing to write a gif3
>device driver that has my color choices hard-coded into it.
>
>Can you tell me the best way to proceed with either method?
>
>Thank you,
>
>David
>
>-- 
>
>David Ovens            e-mail: address@hidden
>(206) 685-8108          plan: Real-time MM5 forecasting for Pacific Northwest
>Research Meteorologist
>Dept of Atmospheric Sciences, Box 351640
>University of Washington 
>Seattle, WA  98195
>