[vtkusers] mapping floating image to color image using vtkImageMapToColors

[Bill Lorensen]

Can you post a small, compilable example that illustrates the problem?



On Fri, Jul 19, 2013 at 9:20 PM, Rick Frank <rickfrank at me.com> wrote:

>
> Hi,
>
> I'm getting some behavior I don't understand when trying to map gray
> floating point image to a color image
>
> What I'm seeing is that the output is completely white.
>
> my code is roughly as follows
>
> filter->SetOutputFormatToRGBA()
>
> colorTable->SetTableRange(0,1)
> colorTable->SetHueRange(0,1);
> colorTable->SetSaturationRange(0,1);
> colorTable->SetValueRange(0,1);
> colorTable->SetRampToLinear();
>
> colorTable->ForceBuild();
>
> Now, when I trace through the code, the values set in the RGBA image look
> correct. But the ultimate rendered image is completely white.
>
> If I modify the code so that all the RGBA values are 1,0,0,255 the image
> is solid red. If I change the alpha to 64 nothing changes.
>
> So, I suspect it's the mapper - I use the same mapper - vtkImageMapper to
> display the color image by resetting the input connection:
>
> mapper->SetInputConnection(filter->GetOutputPort());
> imageActor->SetMapper(mapper);
>
> Do I need to make a change to the mapper to get the proper RGBA display?
>
>
> Thanks
>
> Rick
>
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-- 
Unpaid intern in BillsBasement at noware dot com
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