[Insight-users] When to set image spacing?

[Luis Ibanez]

Hi David,

Thanks for reinstalling the files.

The problem is that you are not calling FillBuffer()
so the buffer of your image is not initialized.

You are only calling SetPixel() in  a couple of pixels
but all the others are left at the random values that
the memory buffer may have had.


Just call:

     image->FillBuffer( 0 );

after you call image->Allocate();


    Regards,


          Luis


---------------------------------------------------------------
On Sat, Aug 8, 2009 at 8:36 PM, David Doria
<daviddoria+itk at gmail.com<daviddoria%2Bitk at gmail.com>
> wrote:

>
> On Sat, Aug 8, 2009 at 7:18 PM, Luis Ibanez <luis.ibanez at kitware.com>wrote:
>
>>
>> Hi David,
>>
>> The settings of Origin, Spacing and Direction are independent
>> of the memory allocation process. You could do it after or before.
>>
>>
>> There shouldn't be any difference between an image for which
>> you assigned the spacing before Allocate() and the one for which
>> you assigned the spacing after Allocate().
>>
>>
>> Something else should be going on here...
>>
>>
>> Have you verified the values of spacing by opening the .vtk
>> files with a text editor ?
>>
>> BTW: I couldn't get to the two links that you posted.
>>
>>
>>      Regards,
>>
>>
>>              Luis
>>
>
> Ah sorry, I goofed and moved the files on my webserver. The files are here:
> http://www.rpi.edu/~doriad/ITK_List/SetImageSpacing/<http://www.rpi.edu/%7Edoriad/ITK_List/SetImageSpacing/>
>
> As a side note - is there a way to have a user accessible web space for
> things like this? It seems like it would be a good idea if two years later
> when someone reads a post the files still be available, rather than people
> (like myself) forgetting to leave files where they will be available, or
> student accounts disappearing upon graduation, or other web hosting services
> dying, etc. Something like http://www.itk.org/ListFiles - maybe the files
> can even have a little link of which list message they belong to or
> something? Just a thought...
>
> Back to the problem -
>
> good.cpp produces good.vtk
> bad.cpp produces bad.vtk
>
> The only difference (at least that I intended and can detect) is the
> placement of setting the image spacing. I examined the ascii header of the
> vtk files and they look to be the same, but the content of the files is
> binary so I can't check it manually. In paraview the two files look very
> different though.
>
> Thanks,
>
> David
>
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