[vtkusers] Clarification and help using vtkLookupTable
masterwangzx at gmail.com
Fri Nov 2 23:28:35 EDT 2018
I have the same problem as Neel. I read your answer, but still don't
understand why it works like that. Could you do me a favour to have a look
and tell me what does *SetRange()* work.
Thank you, and I look forward to hearing from you.
David E DeMarle wrote
> 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" <
> > 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
>> 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
>> 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
>> 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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