[Insight-users] How to cast from RGB to short?

[Michael Xanadu]

Hi,

I've got a watershed filtered image processed by a colormapper. So it's an
image of type:

    typedef itk::RGBPixel<short>   RGBPixelType;
    typedef itk::Image<RGBPixelType, 2>    RGBImageType;

Now I want to filter that image with a connected threshold filter, because I
need it this way.
But ConnectedThresholdImageFilter can't process such RGB images.
I tryed to convert the image into a short type by using CastImageFilter,
too.
But I always get:

    error C2440: 'static_cast' : cannot convert from
'itk::RGBPixel<TComponent>' to 'short'

So how can I cast from RGB to short? Or how to filter a RGB image with a
connected threshold filter?


Michael
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