Overlapping pcolor() plots

I have three seperate pcolor() plots that I want to merge into one single
plot (see attached file). Each plot uses a binary color scheme (white and
blue, white and red, and white and green). I tried to overlap the plots by
using the alpha command, but the output looks rather poor (for example, when
I do overplot three pcolor()'s, I set the alpha of the bottom most plot to
1, and lesser values for the two remaining plots which lie on top of the
third). The final result does not look presentation worthy. Is there a
straight-forward way to present multiple pcolor() plots and have the colors
overlap in a transparent way? In the attached image, the plots to be merged
into a single plot are the two plots in the first row, and left plot in the
second row.

http://old.nabble.com/file/p30087644/contour_phase_boundary.png

Any suggestions would be greatly appreciated!

ยทยทยท

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2010/10/29 chewbaccabacca <jsschreck@...287...>:

I have three seperate pcolor() plots that I want to merge into one single
plot (see attached file). Each plot uses a binary color scheme (white and
blue, white and red, and white and green). [...]

http://old.nabble.com/file/p30087644/contour_phase_boundary.png

You might want to use imshow(),
http://matplotlib.sourceforge.net/api/axes_api.html#matplotlib.axes.Axes.imshow.

Just plot a RGB image. Admittedly you will have to think about how to
manage it to get white instead of black background. Seems this
questions is a problem of how to define the plot task.

Friedrich