[ncl-talk] convert colormap from GrADs

[Buzan, Jonathan]

Hi Deba,

When Red=Green=Blue, one is left with something between black and white, dependent on the saturation. 255 255 255 = white; 0 0 0 = black. The last 4 colors in your custom file are all R=G=B, so they will be some shade of grey.

Cheers,
-Jonathan




On Jan 12, 2022, at 4:52 AM, Debasish Hazra <debasish.hazra5 at gmail.com<mailto:debasish.hazra5 at gmail.com>> wrote:

I created a new colorbar following $NCARG_ROOT/lib/ncarg/colormaps/grads_default.rgb and named them as I need them from GrADS :
ncolors = 8
# r   g   b
 240  240  240
 220  220  255
 165  165  255
 255  105  180
  40   40   40
  80   80   80
 120  120  120
 160  160  160

copied to as $NCARG_ROOT/lib/ncarg/colormaps/grads_defaultprecip.rgb and in NCL programm calling it as  gsn_define_colormap(wks,"grads_defaultprecip"), but I am getting all shades of gray. instead of green and yellow produced in Grads. Do I need to convert GrADS rgb values for ncl ? Attached is two color pictures. Any suggestions.
Thanks
Deba


On Tue, Jan 11, 2022 at 6:35 PM Dennis Shea <shea at ucar.edu<mailto:shea at ucar.edu>> wrote:
https://www.ncl.ucar.edu/Document/Graphics/color_table_gallery.shtml#GrADS

On Tue, Jan 11, 2022 at 3:11 PM Buzan, Jonathan via ncl-talk <ncl-talk at mailman.ucar.edu<mailto:ncl-talk at mailman.ucar.edu>> wrote:
Hello Debasish,

There’s a whole section on creating color tables:
https://www.ncl.ucar.edu/Document/Graphics/create_color_table.shtml

Cheers,
-Jonathan



On Jan 11, 2022, at 10:56 PM, Debasish Hazra via ncl-talk <ncl-talk at mailman.ucar.edu<mailto:ncl-talk at mailman.ucar.edu>> wrote:

Hello,
How do I convert GrADS rgb colorbar to NCL colormap. I have the following in GrADS:

'set rgb 79 240 240 240'
'set rgb 20 220 220 255'
'set rgb 19 165 165 255'
'set rgb 98 255 105 180'
'set rgb 33  40  40  40'
'set rgb 44  80  80  80'
'set rgb 55 120 120 120'
'set rgb 66 160 160 160'

Any help ?
Thanks
Debasish
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<gradsone.jpg><ncl_cbfromgrads.jpg>

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