[vtkusers] A LUT for each image in vtkImageBlend

[Luis Roberto P. Paula]

Thanks David!!

This is just what I was looking for!!

I'm curious on how to solve this using another actor for the marker since
I'm using vtkImageViewer2.

Thanks & Regards,
Luis

On Tue, Jun 29, 2010 at 8:30 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Luis,
>
> The LUT can be set in a separate step, using vtkImageMapToColors. With
> vtkImageMapToColors, you can use SetOutputFormatToRGB() or
> SetOutputFormatToRGBA().
>
> image1 -> vtkImageMapToColors (RGB) -> image1_rgb
> marker -> vtkImageMapToColors (RGBA) -> marger_rgba
>
> (image1_rgb , marker_rgba) -> vtkImageBlend -> composite_rgb
>
> Also, if your marker image is smaller than your main image, you can
> position it in the main image by using vtkImageChangeInformation:
>
> marker -> vtkImageChangeInformation::SetExtentTranslation() ->
> marker_new_position
>
> By adjusting the vtkImageChangeInformation to change the extent of the
> second image input for vtkImageBlend, you can adjust where it will
> appear relative to the first image.
>
> Another option (that does not use vtkImageBlend) is to use a separate
> actor for the marker.
>
>  David
>
>
>
> On Mon, Jun 28, 2010 at 9:16 PM, Luis Roberto P. Paula
> <luisrpp at gmail.com> wrote:
> > Hi All,
> >
> > I have two images:
> >
> > vtkImageData object;  // Contains the object of interest - Grey scale
> image (0 - 256)
> > vtkImageData marker;  // Just the marker for the object - Binary Image
> with same size of 'object'
> >
> > I need to display the marker over the object in a GUI. To do that, I`m
> using the vtkImageBlend:
> >
> >   vtkImageBlend* blend = vtkImageBlend::New();
> >   blend->RemoveAllInputs();
> >   blend->AddInput(object);
> >   blend->AddInput(marker);
> >   blend->SetOpacity(1, opacity);
> >   blend->Update();
> >
> > Then, I'm setting the output image to a vtkImageViewer2.
> >
> > So far so good, but the problem is that I have to control the opacity to
> see the marker.
> >
> > Is it possible to set a LUT for each image in vtkImageBlend, so I can set
> the marker a different color for the marker, without the need to set
> opacity?
> >
> > If this is not the correct approach to do this kind of effect, could
> someone give me some guidance?
> >
> > Thanks & Regards,
> > Luis
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