As you can see from the error, the dimension of your input is wrong
(it needs to be transposed).
Furthermore, matplotlib expects the rgb values in 0-1.
replace
colormap = matplotlib.colors.ListedColormap(palette,'custom-orange')
with
colormap = matplotlib.colors.ListedColormap(palette.T/255.,'custom-orange')
Regards,
-JJ
On Wed, Jun 16, 2010 at 11:13 AM, Jim Vickroy <jim.vick...@noaa.gov> wrote:
> Hello,
>
> The attached script shows my (failed) attempt to define a custom color map
> from a set of RGB values (taken from an IDL palette).
>
> My approach is presumably completely wrong, but I have not found information
> or examples on how to do this.
>
> Could someone point in the right direction?
>
> Thanks,
>
> -- jv
>
> P.S.
> When run on my workstation, the output from the attached script is:
>
> <output>
> Python version: 2.6.4 (r264:75708, Oct 26 2009, 08:23:19) [MSC v.1500 32
> bit (Intel)]
> matplotlib version: 0.99.3
> numpy version: 1.4.0
> Traceback (most recent call last):
> File "custom-colormap.py", line 97, in <module>
> plotter.savefig('%s.png' %colormap.name, facecolor='black',
> edgecolor='black')
> File "C:\Python26\lib\site-packages\matplotlib\pyplot.py", line 356, in
> savefig
> return fig.savefig(*args, **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 1032, in
> savefig
> self.canvas.print_figure(*args, **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\backend_bases.py", line
> 1476, in print_figure
> **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 358, in print_png
> FigureCanvasAgg.draw(self)
> File "C:\Python26\lib\site-packages\matplotlib\backends\backend_agg.py",
> line 314, in draw
> self.figure.draw(self.renderer)
> File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\figure.py", line 773, in
> draw
> for a in self.axes: a.draw(renderer)
> File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\axes.py", line 1701, in
> draw
> im.draw(renderer)
> File "C:\Python26\lib\site-packages\matplotlib\artist.py", line 46, in
> draw_wrapper
> draw(artist, renderer, *args, **kwargs)
> File "C:\Python26\lib\site-packages\matplotlib\image.py", line 237, in
> draw
> im = self.make_image(renderer.get_image_magnification())
> File "C:\Python26\lib\site-packages\matplotlib\image.py", line 182, in
> make_image
> x = self.to_rgba(self._A, self._alpha)
> File "C:\Python26\lib\site-packages\matplotlib\cm.py", line 167, in
> to_rgba
> x = self.cmap(x, alpha=alpha, bytes=bytes)
> File "C:\Python26\lib\site-packages\matplotlib\colors.py", line 489, in
> __call__
> if not self._isinit: self._init()
> File "C:\Python26\lib\site-packages\matplotlib\colors.py", line 720, in
> _init
> for c in self.colors], np.float)
> File "C:\Python26\lib\site-packages\matplotlib\colors.py", line 311, in
> to_rgb
> raise ValueError('to_rgb: Invalid rgb arg "%s"\n%s' % (str(arg), exc))
> ValueError: to_rgb: Invalid rgb arg "(0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 2, 2, 3,
> 4, 4, 5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 22, 23, 25,
> 26, 28, 29, 31, 33, 34, 36, 38,
> 40, 41, 43, 45, 47, 49, 50, 53, 55, 57, 59, 61, 64, 66, 68, 70, 72, 74, 76,
> 79, 82, 84, 87, 89, 91, 94, 96, 99, 101, 104, 106, 108, 110, 113, 116, 118,
> 121, 124, 127, 128, 131, 134, 137
> , 138, 141, 144, 147, 149, 152, 155, 156, 160, 161, 164, 168, 169, 172, 174,
> 177, 179, 182, 184, 188, 189, 191, 195, 196, 198, 202, 203, 205, 209, 211,
> 212, 214, 216, 220, 222, 224, 225
> , 227, 229, 231, 233, 235, 237, 239, 241, 243, 245, 247, 249, 251, 253, 255,
> 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255
> , 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255
> , 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255
> , 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255, 255,
> 255, 255, 255, 255, 255, 255, 255, 255)"
> sequence length is 256; must be 3 or 4
> </output>
>
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