[vtkusers] custom colormap

[Amy Squillacote]

Hi Fred,

You can either manually set the values in a vtkLookupTable (using 
methods like SetTableValue): 
http://www.vtk.org/doc/nightly/html/classvtkLookupTable.html, or you 
can try using a vtkColorTransferFunction: 
http://www.vtk.org/doc/nightly/html/classvtkColorTransferFunction.html. 
vtkColorTransferFunction lets you set colors for specific scalar 
values and then interpolates between them.

- Amy

At 09:30 AM 4/26/2006, fred wrote:
>Hi all,
>
>I have two types of data.
>
>First is module complex.
>So values goes from 0 to vmax as this :
>
>0          ---->          vmax
>blue   green          red
>
>which is good.
>
>Second type is real part of imaginary part of complex.
>Values goes from vmin=-vmax to vmax as this
>
>-vmax  ---->      0     ---->    vmax
>blue               green            red
>
>So null values are green.
>
>I whish I have them in white (or black) as this :
>
>- vmax    ---->        0        ---->   vmax
>    blue   green     white   yellow   red
>
>How can I setup LUT to have this ?
>Any links or URL ?
>
>Thanks in advance.
>
>Cheers,
>
>--
>Fred.
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