[vtkusers] A LUT for each image in vtkImageBlend

[Luis Roberto P. Paula]

Thanks for the tip David.

Will I have any other limitations using qvtkwidget (QT widget) as well?

Thanks,
Luis

On Wed, Jun 30, 2010 at 9:32 AM, David Gobbi <david.gobbi at gmail.com> wrote:

> The vtkImageViewer classes are meant to be a "quick-and-dirty" way of
> displaying images.  If you want to do anything beyond basic image
> display, you should use a vtkRenderWindow and a vtkImageActor.  Then
> you have the full power of VTK available to you, with multiple actors,
> overlays, all the interactors, etcetera.
>
>  David
>
>
> On Tue, Jun 29, 2010 at 11:13 PM, Luis Roberto P. Paula
> <luisrpp at gmail.com> wrote:
> > 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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