[vtkusers] Clarification and help using vtkLookupTable
David E DeMarle
dave.demarle at kitware.com
Tue Aug 8 05:45:49 EDT 2017
Take out the calls to set ramp and especially build. Build replaces all of
the value:colors you've set with automatically generated ones.
On Aug 7, 2017 8:04 PM, "Neel Patel 0-0-0" <siva.yedithi at gmail.com> wrote:
> Hi All,
> I'm trying to use vtkLookupTable to add color in my image, something
> like what they show on the weather forecasts. From what I understand,
> SetRange(0,255) means that any pixel value in the image that is in between
> the min and max, will be assigned a value that has been set by
> SetTableValue(0, 0, 0, 0, 0) and SetTableValue(255, 255, 255, 255, 1). To
> test this out I made a simple lookupTable where everything except for 0 was
> given a rgb value of 255, 0, 0;
> vtkLookupTable table = vtkLookupTable.New();
> table.SetRange(0, 255);
> table.SetTableValue(0, 0, 0, 0, 0);
> for (int i = 1; i < 255; i++)
> table.SetTableValue(i, 255, 0, 0, 0.3);
> This however still gives me and image with red, green, and blue showing up
> instead of just red. Also just to note this is on top of a black/white
> image, so there aren't any other places from which the colors could come
> from. Any help would be appreciated. Thanks.
> Neel Patel
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