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John,
I think that the changes I made in CVS over the weekend provide a much 
easier way to do this, as illustrated in the new examples/image_masked.py.
Eric
John Hunter wrote:
>>>>>>"Danny" == Danny Shevitz <sh...@la...> writes:
> 
> 
> Danny> I just got back from vacation sorry for the delay. If you
> Danny> haven't worked out your own solution yet, I took John's
> Danny> suggestions and made some very minor additions to them. If
> Danny> you are interested, I can post the resulting code which
> Danny> allows you to specify a base colormap and then override
> Danny> arbitrary sentinels with specified colors.
> 
> Danny> One problem with John's algorithm as written in his
> Danny> original post, was that the sentinel was included in the
> Danny> normalization and should not be.
> 
> I think this would make a nice wiki entry if you get the time.
> 
> http://www.scipy.org/wikis/topical_software/MatplotlibCookbook
> 
> 
> 
> JDH
> 
> 
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>>>>> "Danny" == Danny Shevitz <sh...@la...> writes:
 Danny> I just got back from vacation sorry for the delay. If you
 Danny> haven't worked out your own solution yet, I took John's
 Danny> suggestions and made some very minor additions to them. If
 Danny> you are interested, I can post the resulting code which
 Danny> allows you to specify a base colormap and then override
 Danny> arbitrary sentinels with specified colors.
 Danny> One problem with John's algorithm as written in his
 Danny> original post, was that the sentinel was included in the
 Danny> normalization and should not be.
I think this would make a nice wiki entry if you get the time.
http://www.scipy.org/wikis/topical_software/MatplotlibCookbook
JDH

I just got back from vacation sorry for the delay.
If you haven't worked out your own solution yet, I took John's suggestions 
and made some very minor additions to them. If you are interested, I can 
post the resulting code which allows you to specify a base colormap and 
then override arbitrary sentinels with specified colors.
One problem with John's algorithm as written in his original post, was that 
the sentinel was included in the normalization and should not be.
D
At 09:21 PM 11/25/2005 -0600, you wrote:
> >>>>> "Gerald" == Gerald John M Manipon 
> <Ger...@jp...> writes:
>
> Gerald> Hello, I'm trying to plot some grid data using basemap and
> Gerald> imshow however haven't figured out how to specify the
> Gerald> color for nan values. For example, in my data, valid
> Gerald> values range from 0.0-10.0. I've assigned -9999.0 and
> Gerald> 1e30 to the missing values and when I imshow (setting
> Gerald> vmin=0.0, vmax=10.0), the missing values show up in the
> Gerald> low and high end of the spectrum, respectively. Is there
> Gerald> a way to do this?
>
>See the archives for a post by Danny Shevitz and followups in the
>thread "obscure colormapping issue related to quantization"
>
>http://article.gmane.org/gmane.comp.python.matplotlib.general/2856/match=obscure+colormapping+issue+related+to+quantization
>
>Basically, you want to write a custom normalization and colormapping
>instance, and recipe code is posted in the thread linked above.
>
>JDH
>
>
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These are some very basic installation questions from someone
upgrading from 10.3 to 10.4 OS X. I installed the 2.4.1 binary
installation of python on 10.4.3 OS X. I also installed (the amazing)
ipython and Tcl/Tk Aqua which seem to work. Instead of using a v0.82
binary package of matplotlib I decided to try building from the 0.85
release.
This has been more of a challenge than I expected. I
compiled/installed versions of freetype and libpng but I'm not really
sure if or how to get matplotlib to find them. Anyway, I didn't
notice errors when matplotlib installed but when running ipython and
typing import pylab I get the exception below. Does anyone have a
suggestion for what might be wrong?
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packag=
es/matplotlib/font_manager.py
 37 import matplotlib
 38 from matplotlib import afm
---> 39 from matplotlib import ft2font
 40 from matplotlib import rcParams, get_data_path, get_home, get_confi=
gdir
 41
ImportError: Failure linking new module:
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packag=
es/matplotlib/ft2font.so:
Symbol not found: _vsprintf$LDBLStub
 Referenced from:
/Library/Frameworks/Python.framework/Versions/2.4/lib/python2.4/site-packag=
es/matplotlib/ft2font.so
 Expected in: dynamic lookup
Also I noticed that darwinports has freetype, etc, and seems much
easier to use to install and manage various unix tools and libraries.
It seems to like to put everything in /opt/local/. How can I get
matplotlib to check there for libraries (assuming that's the problem)?
-- David