Re: [Matplotlib-users] colors

[Eric F. <ef...@ha...>]

On 2014/06/17, 8:59 AM, Bruno Pace wrote:
> Hi all,
>
> I'm trying to use imshow to plot some values which fall on the interval
> [0,1]. I need to
> use a logscale to emphasize the scales of the data. The solution I found
> checking some discussions was like this
>
> plt.imshow(X, interpolation='none', norm=matplotlib.colors.LogNorm())
>
> However, I notice that the way these colors are assigned are not always
> the same (although my data always contains the minimum value 0.0 and
>   the maximum 1.0). I need to have a coherent color scale to indicate
> the real values. Is it easier to do the color code myself? What is the
> proper way of tackling this problem??

Use the vmin and vmax kwargs to LogNorm, remembering that vmin must be 
greater than zero for a log scale.

Eric

>
> It's pretty much the same problem described here, but with a logscale...
>
> http://stackoverflow.com/questions/7875688/how-can-i-create-a-standard-colorbar-for-a-series-of-plots-in-python
>
>
> Thank you very much!
>
> Bruno
>
>
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