[ncl-talk] replace part of colormap

[Mary Haley]

Just an FYI: the example Beáta provided is an excellent one for showing how
to create your own color map.

You can also change a color map programmatically, if you don't want to
create a new color map file.

See color_19.ncl at:

http://www.ncl.ucar.edu/Applications/color.shtml#ex19

This uses read_colormap_file to read in the desired color map ("amwg") and
then sets the first color to white.

Cheers,

--Mary


On Mon, May 15, 2017 at 5:12 AM, Marston Johnston <shejo284 at gmail.com>
wrote:

> Hi Beata,
>
>
>
> It worked perfectly per your instructions. Thanks for the help ☺
>
>
>
> Have a great day!
>
>
>
> /M
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Marston S. Johnston, PhD
>
> Department of Earth Sciences
>
> University of Gothenburg, Sweden
>
> Email: marston.johnston at gu.se
>
> SkypeID: marston.johnston
>
> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>
> Only the fruitful thing is true!
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
>
>
> *From: *Beáta Szabó-Takács <szabo.b at czechglobe.cz>
> *Date: *Monday, 15 May 2017 at 11:05
> *To: *Marston Johnston <shejo284 at gmail.com>, NCL Talk <ncl-talk at ucar.edu>
> *Subject: *RE: replace part of colormap
>
>
>
> Hi Marston,
>
> You can produce a new .rgb color palette by copy „amwg256.rgb” and rename
> it e.g „amwg2”.  Open the created amwg2.rgb file and rewrite the first rgb
> numbers: 146  112  219 to 255 255 255 and save the file. After that, you
> have to set your environment variable based on http://www.ncl.ucar.edu/
> Document/Graphics/create_color_table.shtml to use awg2.rgb in your script.
>
> I hope I could help you!
>
> Best regards,
>
> Beata
>
> *From:* ncl-talk-bounces at ucar.edu [mailto:ncl-talk-bounces at ucar.edu] *On
> Behalf Of *Marston Johnston
> *Sent:* Monday, May 15, 2017 10:45 AM
> *To:* NCL Talk <ncl-talk at ucar.edu>
> *Subject:* [ncl-talk] replace part of colormap
>
>
>
> Hi,
>
>
>
> I am using the color palette "amwg” which sets a light purple color for
> the lowest value range.
>
> However, I would like to set this part of the spectrum to “white” instead.
>
> I cannot find an example of how this can be done – if it can be done.
>
>
>
> Does anyone have any idea? Appreciate your thoughts.
>
>
>
> Best,
>
> /M
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> Marston S. Johnston, PhD
>
> Department of Earth Sciences
>
> University of Gothenburg, Sweden
>
> Email: marston.johnston at gu.se
>
> SkypeID: marston.johnston
>
> Phone: +46-31-7864901 <+46%2031%20786%2049%2001>
>
> Only the fruitful thing is true!
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>
>
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