[ncl-talk] color table issues

[Mary Haley]

Hi Grace,

Minor correction to Dennis' email.  The cnFillPalette resource (only one
'l') is what allows you to set the colormap.  It is not a True/False
resource. The resource Dennis was referring to is cnSpanFillPalette:

  res at cnFillPalette = "rainbow"
  res at cnSpanFillPalette = True     ; span the rainbow color ,ap

However, ever since NCL Version 6.1.0, which is now almost 5 years ago, NCL
spans the full color map by default, and you shouldn't need to set
cnSpanFillPalette at all.

Make sure you don't have this line in your script, because this will cause
the color map to not be spanned:

  res at gsnSpreadColors = False

If you do have the above, try either setting it to True, or commenting it
out.

--Mary



On Wed, Sep 27, 2017 at 3:09 PM, Grace Choi <gracesh27 at gmail.com> wrote:

> Hello everyone,
>
> When I try on color table exercises on the ncl website, I only can get 31
> colors to show up on my x11, as opposed to 255 colors that the example
> shows. Should I be particularly concerned about this?
>
> Also, I am wondering if the issue above is related to the issue I've been
> having with other functions, such as gsn_define_colormap(wks,"rainbow").
> When I expect to see actual rainbow colors, I only see different shades of
> blue on my map. Please help.
>
> Sincerely,
> Grace
>
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