On Fri, Dec 10, 2010 at 11:00 AM, Ian Harry <ian.ha...@astro.cf.ac.uk>wrote:
> Hi Ben,
>
> Thanks for the suggestion, unfortunately I get:
>
> Traceback (most recent call last):
> File "spin_bank.py", line 43, in ?
>
> newBlues = mcolors.LinearSegmentedColormap.from_list("newBlues",
> cm.Blues._lut[cm.Blues.N/3:-3, :-1], 256)
> AttributeError: class LinearSegmentedColormap has no attribute 'from_list'
>
> Am I missing something?
>
> Thanks
>
> Ian
>
>
>
> On 10 December 2010 15:50, Benjamin Root <ben.r...@ou.edu> wrote:
>
>> 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
>>
>>
>
>
What version of matplotlib are you using?
Ben Root
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