[vtkusers] fill vtkImageData with RGB data?

[Amy Squillacote]

vtkImageViewer2 does have an instance of vtkImageMapToWindowLevelColors 
(call GetWindowLevel() on the vtkImageViewer2), and that class does allow 
you to set a lookup table.  I have not actually tried this, but it's worth 
looking into.

- Amy

At 05:00 PM 4/11/2005, Mark Wyszomierski wrote:
>vtkImageViewer2 doesn't seem to have a method for adding a color
>transfer function either, so I can't try Dov's suggestion, is this
>correct?
>
>Mark
>
>On Apr 11, 2005 2:50 PM, Dov Grobgeld <dov.grobgeld at weizmann.ac.il> wrote:
> > Hi Mark,
> >
> > One way of doing it is by first quantizing your image into
> > a small set of colors (e.g. 1024) and then using a color lookup
> > table to define the mapping between the color index and the
> > actual RGB color, as well as an optional alpha channel.
> >
> > Using RGB directly (if it is all possible) would make it much
> > more difficult to control transparency through the various
> > lookup tables.
> >
> > Hope this helps.
> >
> > Regards,
> > Dov
> >
> > On Mon, Apr 11, 2005 at 12:48:05PM -0400, Mark Wyszomierski wrote:
> > > Hi,
> > >
> > > I have an RGB image, I would like to load it into an instance of
> > > vtkImageData. I use the following:
> > >
> > > image_data->SetDimensions(cx, cy, 1);
> > > image_data->SetScalarType(VTK_UNSIGNED_CHAR);
> > > image_data->SetNumberOfScalarComponents(3);
> > > image_data->AllocateScalars();
> > > unsigned char *p = (unsigned char*)image_data->GetScalarPointer();
> > >
> > > // Now here I will fill image_data with my RGB components in
> > > RGB..RGB..RGB order.
> > >
> > > When I go to display my image using vtkImageViewer2, they always come
> > > out grey. Is there a way to make it recognize there are really 3 color
> > > channels to create the actual colors?
> > >
> > > Thanks.
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