Re: gray marker

To all,

We looked into this problem internally, and it appears that two
different color tables were used in the runs of this program.
The first color table had some shades of gray, so the gray markers
showed up just fine. The second color table had no gray in it,
so NCL picked the next closest color, which in this case happened to
be a light purple.

Dennis' suggestion below of adding a color with NhlNewColor is the way
to go, if a particular color you want to use is not currently in your
color table.

Cheers,

--Mary

On Wed, 21 Feb 2007, Dennis Shea wrote:

>
>
>
>> I have faced a problem regarding a plot with a gray scale.
>> I set "Grey58" and "Grey88" color in res_at_xyMarkerColor.
>
>> But I get some dark and light purple color markers. I also
>> try to used "gray56" and "gray86" but I get same result.
>
>> I past the figure below. I am using the ncl version ncl-4.2.0.a030_64
>
>> I also tried to do that in NCL version ncl-4.2.0.a033_64
>> but the result is same.
>
>
> ===
> I am speculating.
>
> NCL uses the Graphical Kernal System. Each
> work station can have one color map associated with it.
>
> If you have not explicitly specified a color map
> then you get the default:
>
> http://www.ncl.ucar.edu/Document/Graphics/ColorTables/default.shtml
>
> This has gray colors but you are getting non-gray colors.
> Hence, I speculate that you have specified a color map with
> no gray colors. When you specify gray56, gray86 NCL
> tries to map gray56, gray86 into the color table associated
> with your workstation. eg: gray86 may map into purple. :-(
>
> So, you could add gray56, gray86 to the current color table
> something like:
>
> i = NhlNewColor(wks,0.8,0.8,0.8) will add the gray.
> j = NhlNewColor(wks,0.6,0.6,0.6) will add another gray.
>
> There are many ways to mangle color tables
>
> http://www.ncl.ucar.edu/Applications/color.shtml
>
> Also, Grayscale Colormaps
>
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>
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Received on Fri Feb 23 2007 - 17:14:42 MST