[ncl-talk] fatal:CvtGenArrayToCmap:From array has wrong dimensionality

[Mary Haley]

Xi,

In order to duplicate a color bar from an existing image, you need a tool
that is able to give you the RGB triplets of each color.  You can then turn
this into a color table in NCL.

There are several free tools. I used one called "Digital Color Meter" on my
Mac that gives me the RGB values as I hover my mouse over each color.

The colors will not be exact, because the colors in each box vary slightly
as you move your mouse around. I tried to use the color that was in the
middle of a box.

With this, I was able to create a simple "bar.rgb" file (attached), and
then read this in with NCL to use it as a color map.  See the attached.

On Thu, Nov 20, 2014 at 11:37 AM, Xi Chang <xi.chang01 at gmail.com> wrote:

> Dear Mary,,
>
> Thank you, it works, but i cant not mimic the attached labelbar that I
> found in the journal.
> can you help me, please see attached,
> how can I creat such colorbar with exact color as this labelbar. thank you
> so much for your
> help..
>
> Im looking forward to  your help.
>
> Chang,
>
> On Tue, Nov 18, 2014 at 3:39 PM, Mary Haley <haley at ucar.edu> wrote:
>
>> I think what you want is this:
>>
>> res at cnLevelSelectionMode = "ExplicitLevels"
>> res at cnLevels             = (/-35, -25, -22, -18, -14, -10, -7, -5, -3,
>> -2,-1,-.25, 0 , \
>>                              .25, 1, 2, 3, 5, 7, 10, 14, 18, 22, 25 , 35
>> /)
>> res at cnFillOn             = True
>> res at cnFillColors         = (/16, 25, 45, 50, 60, 65, 81, 70, 78, 85, 90
>> , 0, \
>>                               0, 0, 90, 85, 78, 70, 81, 65, 60, 50, 45,
>> 25, 16 /)
>>
>> cnFillColors is meant to take an array of color index values into the
>> current workstation color map, which is usually set by gsn_define_colormap.
>>
>> cnFillPalette is meant to take an actual color map name, like "rainbow",
>> which will be applied to a color contour plot, and fully spanned by
>> default. You shouldn't use cnFillPalette and cnFillColors together.
>>
>> --Mary
>>
>>
>> On Tue, Nov 18, 2014 at 6:51 AM, Xi Chang <xi.chang01 at gmail.com> wrote:
>>
>>> Anybody know why did I get this error?
>>>
>>> res at cnLevelSelectionMode = "ExplicitLevels"
>>> res at cnLevels      = (/-35, -25, -22, -18, -14, -10, -7, -5, -3,
>>> -2,-1,-.25, 0 , .25, 1, 2, 3, 5, 7, 10, 14, 18, 22, 25 , 35 /)
>>> res at cnFillColors    = True
>>> res at cnFillPalette = (/16, 25, 45, 50, 60, 65, 81, 70, 78, 85, 90 , 0,
>>> 0, 0, 90, 85, 78, 70, 81, 65, 60, 50, 45, 25, 16 /)
>>>
>>> Thank you
>>>
>>>
>>>
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>>>
>>
>
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