Personally, just looking at the images I think B looks more 
professional, the others look faded.  With A and B I see more of 
"contrast" in the core of the radial image (though that might arise from 
a combination of my monitor/eyes, though I usually do quite well in 
colour perception tests).

I think we really need to see a variety of real examples before we make 
a decision though, both in application a.k.a different type of datasets, 
including ones with NaNs; and different graph types, the 3d example will 
make for a good test as we get the same information twice, from height 
and colour, which gives us a reference for comparison.

With the NaNs Andreas, why did you pick B over C?  My eyes see B going 
to white as well, only C as far as I can tell does not go to white.

Looking forward to having a play later :).  I wonder what Parula-based 
colormap would look like if we were to make it linear... one other 
thing, mpl currently doesn't select good bounds with pure 
horizontal/vertical lines, making it very difficult (at least for me) to 
see the perceptual deltas, zoomed in to option_c the line gets 
completely hidden by the axes...

On 03/06/15 09:04, Andreas Hilboll wrote:
> On 03.06.2015 08:54, Juan Nunez-Iglesias wrote:
>> You can always use green for NaN with any of these maps...
> In grayscale that then wouldn't be distinguishable at all ...
>
>> On Wed, Jun 3, 2015 at 4:30 PM, Andreas Hilboll <li...@hilboll.de
>> <mailto:li...@hilboll.de>> wrote:
>>
>>      > I particularly like that A ends on the white end of the spectrum
>>
>>      That's exactly why I don't like A that much.
>>
>>      In many plots, I need a color for NaN results. This color should not
>>      fall within the normal range of the colormap. In case of B and C, it
>>      would be possible to use white as NaN color. When using white for NaN
>>      in A, it would just look like large values. So I guess I'm voting
>>
>>      B > C > A
>>
>>      -- Andreas.
>>
>>      
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>


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