>
> Dear NCL --
>
> I am having a problem getting a black-and-white version of a plot -- the
> eps file generated has a black background, and the page is printed white
> on black, not black on white. In my ncl script, I simply changed the
> colormap from "gui_default" to "gsltod". The scipt, and the two
> versions of the plot can be viewed at /fs/cgd/data0/djnewman/ncl.
>
> script is test.ncl
>
> with colormap = gui_default
> --> test_color.eps
>
> with colormap = gsltod:
> --> test_bw.eps
>
> Any help on reversing b&w would be greatly appreciated.
>
> Thanks,
> Dave Newman
Dave,
As Sylvia pointed out, you have specified a color map that has a black
background and a white foreground. Even if you are setting the
background/foreground colors in your .hluresfile (or other resource
file), anything you set in your NCL script will override the resource
file values.
As Sylvia suggested, you can use the "gsdtol" colormap instead, which
will give you a white background, but it will give you a dark-to-light
colormap, instead of a light-to-dark colormap.
If you want to use "gsltod", but force a white background, then do
something like this:
gsn_define_colormap(wks,"gsltod")
cmap = gsn_retrieve_colormap(wks)
cmap(0,:) = (/1.,1.,1./) ; Set background to white.
; cmap(1,:) = (/0.,0.,0./) ; Set foreground to black.
gsn_define_colormap(wks,cmap)
Note that I commented out the setting of color index 1 to black,
because I don't know if this is what you want. If you don't do this,
then the first two colors of your colormap (indices 0 and 1) will be
white. This is perfectly legal, of course, but might cause problems if
you are writing text using the foreground color.
--Mary
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