On Thu, Dec 9, 2010 at 9:01 AM, Ian Harry <ian.ha...@astro.cf.ac.uk> wrote:
> Hi all,
>
> I am having a problem with manipulating colorbars. I want to take the
> cm.Blues colorbar and edit it so that the lowest end of the colorbar is
> light blue instead of white, or in other words I want to remove the lightest
> 1/4 of the colorbar and just keep the darker end.
>
> Is there any easy way to do this?
>
> Any help would be greatly appreciated!
>
> Thanks
>
> Ian Harry
>
>
Ian,
First, as a point of semantics, you are talking about colormaps, not
colorbars.
I have attempted at one point a framework to allow users to manipulate
colormaps, but it is very difficult to make it work in a generalized
framework. However, it is "relatively" easier to specifically hack a
particular colormap to get the results you need.
import matplotlib.cm as cm
import matplotlib.colors as mcolors
cm.Blues._init() # forces it to internally create the '_lut' array
newBlues = mcolors.LinearSegmentedColormap.from_list("newBlues",
cm.Blues._lut[cm.Blues.N/3:-3, :-1], 256)
This should create a new colormap by reinterpolating the last 2/3rds of the
Blues colordata to a new 256 colors colormap.
I hope this helps!
Ben Root
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