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fred wrote:
Hi,
Please look at the short example attached showing the issue.
I want to display only one contour line, with value 0.8.
Obviously, the color associated with this contour line is bad
(blue instead of red color).
I think the reason is that the contour has its own colormap,
so for only one value, the color is blue.
I don't see anything about this issue in the contour help.
How can I fix this ?
At first I thought you wanted to draw a contour line on both the image
and the colorbar, which you would do this way:
imshow(a)
cb = colorbar()
cs = contour(a, [0.8])
cb.add_lines(cs)
But then I looked at your message again and realized this is not what
you want. If you do what you seem to be saying you want to do, you will
end up with a nearly invisible line: if you use color mapping to
determine the color of the contour line, and you put it on the image, it
will of course not stand out very well. Here is how you would do it:
im = imshow(a)
cb = colorbar()
cs = contour(a, [0.8], norm = im.norm, cmap=im.cmap)
cb.add_lines(cs)
Is this in fact what you want? If nothing else, it illustrates how you
can control the colormap and associated norm (scaling function) used by
contour.
Eric
Thanks in advance.
Cheers,
------------------------------------------------------------------------
#! /usr/bin/env python
from scipy import *
from pylab import *
x, y = ogrid[-3:3:10*1j,-3:3:10*1j]
a = cos(x)*sin(y)
imshow(a)
colorbar()
contour(a, [0.8])
show()
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