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.
Your patch looks reasonable to me.
>
> 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
Good.
> in the attachment). I also remember a particular one ('terrain') in a
> measurement program called 'Igor' that would be nice.
Is there any potential licensing problem? I hope not. I presume you
would copy the effect, not any particular set of numbers extracted from
Igor.
>
> 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?
You mean take the colormaps that have a huge number of color dictionary
entries in _cm.py, and subsample them down to something reasonable?
Please do! I always hated those blocks of numbers, but never enough to
motivate me to do something about them other than a little reformatting.
It sounds like you are talking about going farther than that, which
might be fine but might make things more complicated. As it is now, all
the built-in colormaps are associated with color dictionaries for direct
use in LinearSegmentedColormap. If you make two styles, one based on
the dictionaries (which allows discontinuities) and one based on
from_list (which does not), then you need to keep track of which is
which. Is it worth it? I am inclined to stick with the cdict approach.
It looks like an obvious addition would a function that takes a list of
breakpoints (starting with 0 and ending with 1) and a matching list of
colors and generates the corresponding cdict for continuous mapping.
Eric
>
> Let me know what you think.
>
> Cheers,
------------------------------------------------------------------------------
Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day
trial. Simplify your report design, integration and deployment - and focus on
what you do best, core application coding. Discover what's new with
Crystal Reports now. http://p.sf.net/sfu/bobj-july
_______________________________________________
Matplotlib-devel mailing list
Matplotlib-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
