[GRASS-dev] r.colors.matplotlib

[Steven Pawley]

Thanks Vaclav,

Will see if I can figure out.

Steve

On Thu, Jun 1, 2017 at 8:51 PM, Vaclav Petras <wenzeslaus at gmail.com> wrote:

> Hi Steve,
>
> On Tue, May 30, 2017 at 3:10 PM, Steven Pawley <dr.stevenpawley at gmail.com>
> wrote:
>
>>
>> Thanks for writing the r.colors.matplotlib tools because I use the
>> matplotlib colorramps very frequently both in GRASS and in python more
>> generally.
>>
>
> Glad to hear that.
>
>
>>
>> I seem to be having a problem of using the perceptually uniform ramps in
>> the r.colors.matplotlib add on, receiving the error: ERROR: Matplotlib
>> 2.0.2 does not contain color table <plasma>
>>
>> I'm on linux and matplotlib 2.0.2 has the perceptually uniform ramps, and
>> I can use them if I display data in python within a GRASS session directly
>> (i.e. plt.imshow(numpyraster, cmap='plasma').
>>
>> Is there a reason why r.colors.matplotlib can't see these ramps? It still
>> works with all of the traditional matplotlib ramps.
>
>
> The module does not check for specific color maps in mpl, but it uses
> general code to check the presence of a requested color map. It imports
> matplotlib.cm.datad dictionary. Perhaps, this dictionary does not contain
> the new color maps. The checking is not ideal, it should based on
> cm.get_map() function. I think the reason why I "ask for permission" here
> instead is that I was not able to figure out what is the error state from
> get_map() or how to transfer it to the user. But perhaps you will be more
> successful or 2.0 behaves differently. The relevant code is here:
>
> https://trac.osgeo.org/grass/browser/grass-addons/grass7/
> raster/r.colors.matplotlib/r.colors.matplotlib.py#L164
>
> Best,
> Vaclav
>
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