Fwd: reverse the wks foreground and backgroud color

Dear NCL users,

I am trying to plot topography using the black and white color table
"gsltod", however, after plotting, I found the foreground color of the
workstation is white, and the background color is black, I try to reverse
them by using the following script:

setvalues wks
    "wkColorMap" : "gsltod"
    "wkForegroundColor" : (/0.,0.,0./)
    "wkBackgroundColor" : (/1.,1.,1./)
  end setvalues

However, it does not work, I attached the script, any advice is welcomed!

-- 
Best regards, Guiting
-----------------------------------------------------------------------
*Departamento de Astronomia, Universidad de Guanajuato
Callejon de Jalisco s/n
Colonia de Valenciana
C.P. 36240, Guanajuato,GTO, Mexico*
*E-mail: gtsong@astro.ugto.mx**;guitingsong@gmail.com*
**

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