[vtkusers] Image plane widget + color transfer function?

[Vidyadhar]

Hi,
How about deriving a new class from vtkScalarsToColor similar to 
vtkColorTransferFunction. vtkColorTransferFunction is encapsulating three 
vtkPiecewizeFunctions to represent RGB colors. Add one more 
vtkPiecewiseFunction to represent the opacity. You will need something like 
AddRGBAPoint and other methods and override MapValue method.
HTH
Vidyadhar
----- Original Message ----- 
From: "Paul Melis" <paul at science.uva.nl>
To: <vtkusers at vtk.org>
Sent: Thursday, January 31, 2008 7:36 PM
Subject: Re: [vtkusers] Image plane widget + color transfer function?


> Doh!
> Ah well, thanks anyway :)
>
> dean.inglis at camris.ca wrote:
>
>>I guess you are back to vtkLookupTable again... :(
>>
>>Dean
>>
>>Well, yes, that will make the image-to-colors object output alpha values.
>>But I see no way to *specify* the alpha values anywhere, as a 
>>vtkColorTransferFunction only takes RGB triplets.
>>Maybe I wasn't completely clear, but I want to set an alpha values per 
>>color table entry, not an overall alpha value for the whole IPW.
>>
>>Paul
>>
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>
>