Re: [Matplotlib-users] How to make a bi-variate or 2-dimension colormap?

[Chao Y. <cha...@gm...>]

Dear all matplotlib users,

I am trying to make a geographical map with colors, in which the colors of
pixels will depend on 2-dimensions of (x,y), like the one attached from one
publication. I searched online and this is where I arrive:

https://gist.github.com/ChaoYue/81eb01b558f068f11ee741c56557a6a2

To put it short, I know how to pick up color by x-axis value, and use
y-axis value as an indicator of either saturation, or brightness or
transparency of the color. Or somewhere to convert this (x,y) information
back to linear space and select color from a matplotlib colormap. But is
there some way that I can use different colors for each corner of the small
square as shown in the example, and somewhere interpolate the colors in
between? like the one attached?

These are the online sources that help me, even though I am not sure I
fully understand the tricks inside them ...:

http://stackoverflow.com/questions/15207255/is-there-any-way-to-use-bivariate-colormaps-in-matplotlib

https://github.com/matplotlib/matplotlib/issues/4369

Thanks a lot in advance for any suggestions,

Cheers,
Chao

On Mon, Jul 25, 2016 at 4:34 PM, Chao YUE <cha...@gm...> wrote:

> Dear all matplotlib users,
>
> I am trying to make a geographical map with colors, in which the colors of
> pixels will depend on 2-dimensions of (x,y), like the one attached from one
> publication. I searched online and this is where I arrive:
>
> https://gist.github.com/ChaoYue/81eb01b558f068f11ee741c56557a6a2
>
> To put it short, I know how to pick up color by x-axis value, and use
> y-axis value as an indicator of either saturation, or brightness or
> transparency of the color. Or somewhere to convert this (x,y) information
> back to linear space and select color from a matplotlib colormap. But is
> there some way that I can use different colors for each corner of the small
> square as shown in the example, and somewhere interpolate the colors in
> between? like the one attached?
>
> These are the online sources that help me, even though I am not sure I
> fully understand the tricks inside them ...:
>
>
> http://stackoverflow.com/questions/15207255/is-there-any-way-to-use-bivariate-colormaps-in-matplotlib
>
> https://github.com/matplotlib/matplotlib/issues/4369
>
> Thanks a lot in advance for any suggestions,
>
> Cheers,
> Chao
>
> --
> please visit:
> http://www.globalcarbonatlas.org/
>
> ***********************************************************************************
> Chao YUE
> postdoc at LSCE
> CEA-Ormes des Merisiers, F-91191 GIF-SUR-YVETTE CEDEX
> Tel: 33 1 69 08 41 87
>
> ************************************************************************************
>



-- 
please visit:
http://www.globalcarbonatlas.org/
***********************************************************************************
Chao YUE
postdoc at LSCE
CEA-Ormes des Merisiers, F-91191 GIF-SUR-YVETTE CEDEX
Tel: 33 1 69 08 41 87
************************************************************************************