[vtkusers] vtkImageActor for 10 bit displays?

[Jesús Spí­nola]

On Thu, Nov 3, 2011 at 3:32 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> Hi Jesus,
>
> Most 10-bit displays use a 24-bit RGB to 10-bit greyscale conversion.
> The vtkImageActor is fully capable of 24 bits.
>

How can you achieve 24bits with vtkImageActor? I can't see how to setup the
pipeline.

Say we have a 10 or 12 bit grayscale image (common case in DICOM) stored in
a vtkImageData (2 bytes per pixel). How can you build a pipeline where you
can apply at least a window level operation to your image and achieve a
10bit image in the output?


>  - David
>
>
> On Thu, Nov 3, 2011 at 6:57 AM, Jesús Spí­nola <jspinola at gmail.com> wrote:
> > Hi,
> > I am also interested on this topic.
> > My question is, how can you achieve 10-bit display when vtkImageActor
> > requires data to be of unsigned char type?
> > (http://www.vtk.org/doc/release/5.6/html/a00819.html) This means data
> is cut
> > down to 8-bit, so the resolution is already lost though your vtkImageData
> > were of short  type (2 bytes).
> > On Fri, Apr 29, 2011 at 3:43 PM, David Gobbi <david.gobbi at gmail.com>
> wrote:
> >>
> >> Hi Mark,
> >>
> >> Some (maybe most?) 10-bit displays use a 24-bit RGB to 10-bit
> >> greyscale conversion.  In other words, they are designed to work with
> >> standard 24-bit frame buffers and 24-bit DVI cables.  The 24-bit to
> >> 10-bit conversion may vary from manufacturer to manufacturer, but the
> >> basic idea is that you can achieve 10-bit display simply by applying
> >> the correct RGB lookup table in VTK when displaying the image.
> >>
> >> Is there a specific 10-bit monitor that you are planning to use?
> >>
> >>  - David
> >>
> >>
> >> On Fri, Apr 29, 2011 at 5:13 AM, endlosschleife1
> >> <endlosschleife1 at googlemail.com> wrote:
> >> > Hi,
> >> >
> >> > I would like to render 2D images, potentially also on 10 bit greyscale
> >> > displays. VtkImageActor2D only supports 8 bit (it uses
> GL_UNSIGNED_BYTE
> >> > as
> >> > format for the glTexImage2D calls). Is there currently in way in VTK
> to
> >> > use
> >> > short scalars for 2D texture based image rendering?
> >> >
> >> > Thanks,
> >> >
> >> > Mark
>



-- 
Jesús Spínola
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