[vtkusers] vtkImagePlaneWidget transparent slice?

[David Gobbi]

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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