how to define custom colormap from set of RGB values ?

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:

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

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

custom-colormap.py (5.65 KB)

Give this a shot:

http://www.scipy.org/Cookbook/Matplotlib/Show_colormaps

From:
Jim Vickroy [mailto:Jim.Vickroy@…259…]
8:14 AM
define custom colormap from set of RGB values ?

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:

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

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

···

Sent: Wednesday, June 16, 2010
To: Matplotlib
Subject: [Matplotlib-users] how to

wrote:
Thanks for your reply.
Previously, I had tried something based on the second example at that
URL, but, after considerable time, I could only get a palette that was
“close”. I do not understand how to use that example to replicate an
IDL color map.
The requirement is for me to exactly duplicate the IDL color map
(actually several IDL color maps) listed in my script.
– jv

···

PHobson@…2792…

Give
this a shot:

http://www.scipy.org/Cookbook/Matplotlib/Show_colormaps

From:
Jim Vickroy [] Wednesday, June
16, 2010
8:14 AM
Matplotlib
[Matplotlib-users] how to
define custom colormap from set of RGB values ?

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:

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

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

mailto:Jim.Vickroy@…259…
Sent:
To:
Subject:

You’re not
defining your dictionary in the way specified in the link. In fact, I don’t
think you have a dictionary at all.

“First, create a script that will map the
range (0,1) to values in the RGB spectrum. In this dictionary, you will have a
series of tuples for each color ‘red’, ‘green’, and ‘blue’. The first elements
in each of these color series needs to be ordered from 0 to 1, with arbitrary
spacing in between**. Now, consider (0.5, 1.0,
0.7) in the ‘red’ series below. This tuple says that at 0.5 in the range from
(0,1) , interpolate from below to 1.0, and above from 0.7**. Often,
the second two values in each tuple will be the same, but using different
values is helpful for putting breaks in your colormap. This is easier
understand than might sound, as demonstrated by this simple script”

From:
Jim Vickroy [mailto:Jim.Vickroy@…259…]
9:15 AM
Cc:
matplotlib-users@lists.sourceforge.net
how to define custom colormap from set of RGB values ?

PHobson@…878…2792…
wrote:

Give this a shot:

http://www.scipy.org/Cookbook/Matplotlib/Show_colormaps

Thanks for your reply.

Previously, I had tried something based on the second example at that URL, but,
after considerable time, I could only get a palette that was
“close”. I do not understand how to use that example to
replicate an IDL color map.

The requirement is for me to exactly duplicate the IDL color map (actually
several IDL color maps) listed in my script.

– jv

From:
Jim Vickroy [mailto:Jim.Vickroy@…878…259…]
8:14 AM
define custom colormap from set of RGB values ?

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:

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

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

···

Sent: Wednesday, June 16, 2010
To: Paul Hobson
Subject: Re: [Matplotlib-users]
Sent: Wednesday, June 16, 2010
To: Matplotlib
Subject: [Matplotlib-users] how to

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.Vickroy@...259...> 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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