[Matplotlib-users] how to define a colormap dynamically

[James B. <bo...@ll...>]

I would like to be able to define a new colormap dynamically, that is 
without altering code in cm.py.

It would not appear to be too difficult to some one who knew what they 
were doing. I have made
some attempts following the code in cm.py and other places, but I do 
not seem to be able to get the
normalization correct.

I know that I could just put the data into cm.py but I would rather not 
have to remember to alter this code
for every release of matplotlib and I am sure most people do not want 
my colormaps.

I have used GMT (Generic Mapping Tools) extensively in the past and 
have code to translate the GMT color map
into a form usable by matplotlib.
The site:  http://craik.shef.ac.uk/cpt-city/  has a very large number 
of colormaps in the GMT format and would be a useful resource for 
matplotlib,
   if the data files there could be easily imported.

Thanks for any pointers.

--JIm