Ben -
I got ahead of myself my cropping the image. The color mapping is correct. It
is just different then what I expected. I thought it would partition the height
field data based on the levels array and index into the color array. Turning
off antialiasing did not solve the 'ghost lines'. I will play around with some
of the arguments. It looks to me as if contour is being called with a line
width of 1 and a color of white. Setting these line width to 0 did not make a
difference.
Thanks,
Steve
On Jul 14, 2010, at 5:24 PM, Benjamin Root wrote:
> 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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