[Insight-developers] Questions about itk::ImageIOBase::IOPixelType and Reading/Writing

[Bradley Lowekamp]

Hello Kent,

	That doesn't sounds quite right to me. It is my understanding that in  
the ImageFileReader::GenerateOutputInformation calls the  
ImageIOBase::ReadImageInformation methods. I believe the expected  
behavior is that all the meta data (largest region, origin, spacing  
etc) an the pixel information (pixel type, component type and number  
of components) is read by the derived ImageIO class and configures the  
member variables of ImageIOBase with this information. So NiftiImageIO  
should be detecting the pixel type in the GenerateOutputInformation  
method.

I am not sure of some of the detail your are describe but I hope I  
have helped.

Brad

On Mar 12, 2009, at 1:23 PM, kent williams wrote:

> I noticed this debugging a new itkNiftiImageIO test.
>
> The test was failing with an exception, having to do with trying to  
> convert
> pixel types between a vector of 6 floats and a scalar float.
>
> It turns out that the itkImageIOBase::m_PixelType was scalar, but I  
> was
> trying to read in an image with vector pixel types.
>
> So is this the rule?
>
> When you write a file itkImageFileWriter will set the PixelType for  
> the
> itkImageIO instance, but when you read the itkImageIO instance needs  
> to set
> the PixelType, and the itkImageFileReader then does whatever  
> conversions it
> can to return an image of the requested type.
>
>
>
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========================================================
Bradley Lowekamp
Lockheed Martin Contractor for
Office of High Performance Computing and Communications
National Library of Medicine
blowekamp at mail.nih.gov


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