[vtkusers] Texture Mapping Image Quality

[David Gobbi]

Hi Patrick,

What do you mean by "image characteristics"?  I'm guessing that your
image is either 8-bit greyscale or 24-bit RGB if it is a TIFF.  If
this is the case, then VTK will use the data as a texture without
any conversion, and the only things that should impact quality are
the 32-bit flag I mentioned, and the actor's lighting properties.

By "low quality" do you mean the image looks noisy, or do you mean
that the contrast is poor?

On Mon, 30 Aug 2004, Patrick Lowry wrote:

> Hi David:
>
> Thanks for the quick reply.
>
> I tried your recommended setting and it didn't change the quality.
>
> Do image characteristics affect how they render?
>
> Patrick
>
> At 08:36 AM 8/30/2004, you wrote:
> >Hi Patrick,
> >
> >Some graphics cards default to 16-bit textures, be sure to force
> >VTK to use 32-bit textures:
> >
> >atext SetQualityTo32Bit
> >
> >  - David
> >
> >
> >On Mon, 30 Aug 2004, Patrick Lowry wrote:
> >
> > > To All:
> > >
> > > The texture mapping capabilities of VTK are amazing but I noticed image
> > > quality loss from the original TIFF.  Texture mapping done by a commercial
> > > program I have does not suffer the same quality loss.  The essence of the
> > > image part of the TCL script are shown below.  Any ideas on preventing
> > > image quality loss?
> > >
> > > Thanks in advance.
> > >
> > > Patrick Lowry
> > >
> > > .
> > > .
> > > .
> > > vtkTIFFReader readTIFF
> > >    readTIFF SetFileName "data/test1comp.TIF"
> > >    readTIFF Update
> > > vtkTexture atext
> > >    atext SetInput [readTIFF GetOutput]
> > >    atext InterpolateOn
> > > .
> > > .
> > > .
> > > vtkTextureMapToPlane test
> > >    test SetInput [normals GetOutput]
> > >    test SetOrigin $xmin $ymin 0.0
> > >    test SetPoint1 $xmax $ymin 0.0
> > >    test SetPoint2 $xmin $ymax 0.0
> > >
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