[Insight-users] reading-writing .mhd + raw data

[Zoltan Seress]

Hi Luis!
Next morning I managed to solve the problem, but thanks the exhaustive
answer.

On Sat, Aug 8, 2009 at 6:57 PM, Luis Ibanez <luis.ibanez at kitware.com> wrote:

>
> Hi Zoltan,
>
> There are three pixel types involved here:
>
>    1. The PixelType of the image in the input file
>    2. The PixelType that you used to declare your image in your program
>    3. The PixelType of the image in the output file
>
> The itkImageFileReader, by default converts the pixel type of the input
> image
> (1) to the pixel of the image that you declared in your code (2), then when
> you
> write the image to disk, the pixel type of the output image (3) will be
> exactly
> the same used in the typedef in your code (2).
>
>
> Therefore, the reason why your output image is of type USHORT is that you
> probably used in your code a typedef similar to:
>
>       typedef unsigned short PixelType;
>       typedef itk::Image< PixelType, Dimension >  ImageType;
>       typedef itk::ImageFileReader< ImageType > ReaderType;
>
> If you know that your input image is of pixel type: UCHAR
> then you should use a declaration such as:
>
>       typedef unsigned char PixelType;
>
>
>
>    Regards,
>
>
>           Luis
>
>
> ----------------------------------------
>
> On Wed, Aug 5, 2009 at 10:33 AM, Zoltan Seress <seress.zoltan at gmail.com>wrote:
>
>> Dear members!
>> I am a newbie in ITK and I ran into an annoying problem. I try to read raw
>> data (obtained from brainweb) with the support of its .mhd header, then
>> write it without any modification as it is presented in the user's guide.
>> But at the end the resulted .mhd contains different information
>> about ElementType, namely the original MET_UCHAR is replaced with
>> MET_USHORT, what's more the resulted raw data size decreases. What is hidden
>> in the background?
>> Thanks in advance!
>>
>> Cheers,
>> --
>> Zoltan Seress
>>
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>


-- 
Zoltan Seress
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