Re: [Matplotlib-users] [matplotlib-devel] RFC: candidates for a new default colormap

[Benjamin R. <ben...@ou...>]

Furthermore, I think there is some work being done to add functionality to
the Norm to allow specifying a middle value along with a vmin and a vmax.

Ben Root

On Fri, Jun 5, 2015 at 3:20 PM, Eric Firing <ef...@ha...> wrote:

> On 2015/06/05 8:17 AM, Sourish Basu wrote:
> > Very often the "zero" of an anomaly is not at the center of the extrema,
> > and requires creating a custom diverging colormap anyway (see attached
> > example).
>
> Reminder: in matplotlib, color mapping is done with the combination of a
> colormap and a norm.  This allows one to design a norm to handle the
> mapping, including any nonlinearity or difference between the handling
> of positive and negative values.  This is more general than customizing
> a colormap; once you have a norm to suit your purpose, you can use it
> with any colormap.
>
> Maybe this is actually what you are already doing, but I wanted to point
> it out here in case some readers are not familiar with this
> colormap+norm strategy.
>
> Eric
>
>
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