[vtkusers] Fwd: vtkImagePlaneWidget transparent slice?

[Mengchen Zhu]

---------- Forwarded message ----------
From: Mengchen Zhu <mengchen.zhu at gmail.com>
Date: Wed, Apr 16, 2008 at 3:46 PM
Subject: Re: [vtkusers] vtkImagePlaneWidget transparent slice?
To: David Gobbi <david.gobbi at gmail.com>
Cc: vtkusers at vtk.org


Hi,

Thanks David. It didn't work when I set it to (0,1,2), but worked when I set
it to (0) only... This is weird because if the first 3 components from
output of reader are R, G, B values, I shouldn't get grey-level image when
only extracting first channel. It looks more like YGrGb or something like
that... Anyway thanks.

Mengchen


On Wed, Apr 16, 2008 at 1:08 PM, David Gobbi <david.gobbi at gmail.com> wrote:

> This transparency problem should only happen if your TIFF (or BMP)
> files are actually 32-bit RGBX format instead of the 24-bit RGB that
> you are expecting.  The forth component "X", if present, will be used
> as transparency by the ImagePlaneWidget.  Unless you are completely
> certain that your images are really RGB and not RGBX, you can try
> using vtkImageExtractComponents with SetComponents(0,1,2).  That will
> get rid of the fourth component, if it exists.
>
>    David
>
>
> On Wed, Apr 16, 2008 at 3:43 PM, Mengchen Zhu <acidwind at gmail.com> wrote:
> > Hi all,
> >
> > I've modified ImagePlaneWidget.cxx (under VTK widgets/testing folder) to
> > read in series of bmp (or tiff) image files, and display the
> interpolated
> > volume using 3 orthogonal planes. The resliced image can be properly
> > displayed using ImageActor; however, the 3 orthogonal planes controlled
> by
> > ImagePlaneWidget are semi-transparent, while if the input are the sample
> > 16-bit  images(headsq), the planes are opaque. I've tried to change
> > parameters of "ipwProp" to set the texture plane property, but still
> > couldn't get opaque planes with my dataset.
> >
> > Has anyone seen a similar problem before? By the way, my data files are
> > 24-bit BMP images with range 0~255.
> >
> > Thanks,
> > Mengchen Zhu
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