Re: [matplotlib-devel] Color map gamma

[Gary R. <gr...@bi...>]

I think this would be useful.
While you're at it, in the attached file I have a function 
"rescale_cmap" that effectively changes the autoscaling of the colormap 
to the data by allowing specification of the range limits - I find this 
useful.
You might like to look at this to see if it's worth generalising your 
additions a little,

Gary

Reinier Heeres wrote:
> Hi all,
> 
> I would like to propose the attached patch to be able to use a gamma
> value for color maps. This will make it simple to make your color
> scale more 'sensitive' at the bottom or at the top, as can be seen in
> the attached example. This could in principle also be solved by adding
> a gamma normalizer, but I think that applying it to a color map is
> quite coming practice, so in this case the preferred way.
> 
> I'd also like to add a few extra color maps (at least one plain
> blue-white-red and one with darker shades at the high and low ends, as
> in the attachment). I also remember a particular one ('terrain') in a
> measurement program called 'Igor' that would be nice.
> 
> Looking at _cm.py, I would guess that could be done a bit more
> efficient than the current 5880 lines as well by just specifying a few
> colors and using LinearSegmentedColormap.from_list(). Is it ok if I
> try to refactor that?
> 
> Let me know what you think.
> 
> Cheers,