Steve,
The ghost lines appear to be an artifact of the anti-aliasing. In my tests,
setting antialiased=False eliminates those lines.
The colormap looks fine to me. If you doubt it, try turning on the colorbar
to see if the values are correctly associated with the proper colors.
Ben Root
On Wed, Jul 14, 2010 at 6:24 PM, Steve McFarlin <st...@stevemcfarlin.com>wrote:
> Ben -
>
> You can see the image at http://www.surfguru.com/smc/TestRender.png . With
> a continuous level array [1 .. 18] the image looks like
> http://www.surfguru.com/smc/TestRender2.png
>
>
> Thanks,
> Steve
>
> On Jul 14, 2010, at 4:12 PM, Benjamin Root wrote:
>
> Steve,
>
> Could you please attach an example image of what you are seeing?
>
> Ben Root
>
> On Wed, Jul 14, 2010 at 5:52 PM, Steve McFarlin
> <st...@stevemcfarlin.com>wrote:
>
>> Hello,
>>
>> I am trying to create a color map that maps 18 colors across 50 levels. As
>> an example let say I have three colors [r,g,b] and want everything between 1
>> an 2 to be r, 3 through 10 to be g, and 11 through 50 to be b. From what I
>> can tell it does not seem to be possible. Currently this is what I have, but
>> it does not seem to work as I assumed.
>>
>> colorList =
>> [[0.,0.,102./255.],[0,42./255.,217./255.],[0,110./255.,217./255.],[0,178./255.,217./255.],
>>
>>
>> [0,212./255.,212./255.],[0,217./255.,166./255.],[0,217./255.,0],[149./255.,217./255.,0],
>>
>>
>> [217./255.,217./255.,0],[217./255.,174./255.,0],[217./255.,131./255.,0],[217./255.,87./255.,0],
>>
>> [217./255.,0,0],[174./255.,0,0],[140./255.,0,0],[135./255.,0,0],
>> [105./255.,0,0],[65./255.,0,0]]
>>
>> levels = [1,2,3,4,5,6,7,8,9,10,12,15,20,25,30,35,40,50]
>> cmap = matplotlib.colors.ListedColormap(colorList, name = 'theColorMap', N
>> = len(colorList))
>> ...
>> m.contourf(x,y,z,cmap=cmap, levels=levels, extend='both')
>>
>> If the levels array is continuous then it works as expected. With the
>> above settings I get unexpected results, which includes 'ghost contour
>> lines'. The data I am rendering is from a GRIB file from NOAA.
>>
>> Is this possible?
>>
>>
>> Thanks,
>> Steve
>>
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