Michael Hearne wrote:
> Does anyone here have any experience converting GMT color palettes
> into pylab colormaps? I took a stab at it, and the results are not
> really what I expected.
>
> GMT, for the unfamiliar, is a scientific plotting/mapping package that
> I'm doing my best to rid myself of. If you've never heard of it, then
> you can probably ignore this message.
>
> Here's my attempt at bringing in a GMT color palette:
>
> #!/usr/bin/python
>
> from pylab import *
>
> #GMT color palette - Colors are specified by a RGB triplet with each
> value in the range
> #0-255. The palette below specifies that a data value between 1 and 2
> will be assigned a color
> #linearly interpreted between the colors (255,255,255) and (191,204,255).
>
> # 0 255 255 255 1 255 255 255
> # 1 255 255 255 2 191 204 255
> # 2 191 204 255 3 160 230 255
> # 3 160 230 255 4 128 255 255
> # 4 128 255 255 5 122 255 147
> # 5 122 255 147 6 255 255 0
> # 6 255 255 0 7 255 200 0
> # 7 255 200 0 8 255 145 0
> # 8 255 145 0 9 255 0 0
> # 9 255 0 0 10 200 0 0
> # 10 200 0 0 13 128 0 0
>
> cdict = {'red': ((0.0,1.00,1.0),
> (0.1,1.00,0.75),
> (0.2,0.75,0.63),
> (0.3,0.63,0.50),
> (0.4,0.50,0.48),
> (0.5,0.48,1.00),
> (0.6,1.00,1.00),
> (0.7,1.00,1.00),
> (0.8,1.00,1.00),
> (0.9,1.00,0.78),
> (1.0,0.78,0.50)),
> 'green': ((0.0,1.00,1.00),
> (0.1,1.00,0.80),
> (0.2,0.80,0.90),
> (0.3,0.90,1.00),
> (0.4,1.00,1.00),
> (0.5,1.00,1.00),
> (0.6,1.00,0.78),
> (0.7,0.78,0.57),
> (0.8,0.57,0.00),
> (0.9,0.00,0.00),
> (1.0,0.00,0.00)),
> 'blue': ((0.0,1.00,1.00),
> (0.1,1.00,1.00),
> (0.2,1.00,1.00),
> (0.3,1.00,1.00),
> (0.4,1.00,0.58),
> (0.5,0.58,0.00),
> (0.6,0.00,0.00),
> (0.7,0.00,0.00),
> (0.8,0.00,0.00),
> (0.9,0.00,0.00),
> (1.0,0.00,0.00))}
>
> my_cmap = matplotlib.colors.LinearSegmentedColormap('my_colormap',cdict)
> pcolor(rand(10,10),cmap=my_cmap)
> colorbar()
> savefig('colormap.png')
>
Michael: The basemap toolkit includes the GMT colormaps. To access
them, import cm from the basemap namespace (from
matplotlib.toolkits.basemap import cm). The names are prefixed with 'GMT_'.
-Jeff
--
Jeffrey S. Whitaker Phone : (303)497-6313
Meteorologist FAX : (303)497-6449
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