[vtkusers] A LUT for each image in vtkImageBlend

[David Gobbi]

Don't worry, using the QVTKWidget should not limit you in any way.

  David


On Wed, Jun 30, 2010 at 7:20 AM, Luis Roberto P. Paula
<luisrpp at gmail.com> wrote:
> 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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>