[vtkusers] Clarification and help using vtkLookupTable

[David E DeMarle]

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);
>             }
>             table.SetRampToLinear();
>             table.Build();
>
> 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.
>
>                            Regards,
>                                 Neel Patel
>
>
>
>
>
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