Re: [Matplotlib-users] contourf problem

[Friedrich R. <fri...@gm...>]

2010/3/29 Alan G Isaac <ala...@gm...>:
> Can you explain this:
> norm = colors.Normalize(vmin = -1, vmax = 1)

The normaliser takes some arbitrary value and returns a value in [0,
1].  Hence the name.  The value \in [0, 1] is handed over to the
cmap's __call__(), resulting in the color value.  And yes, I guess you
can use vmin and vmax directly, it's just a matter of taste.

As you can pass in also *boundaries* to Colorbar(), this may be an
alternative.  It will display all red above the max value, though it's
harder to tick.  When you want the highest value to be really
represented by red, not near-to-red.

Friedrich