Re: [vtkusers] Problem of ScalarType after using vtkImageMathematics

[Aldredo Gourbish]

Hi Amy,
Thank you very much !
It works now. In fact I had tried this class but after using vtkImageCast so the results were bad. Now, just with vtkImageShiftScale it works. :-)

Now I have a small "problem" which is not really a problem : In fact I do this volume subtraction on a DICOM images volume, so with a windowing. So my "problem" is that the windowing of my subtraction is the same than the non subtracted volumes. It could be a "problem" since when done by the MRI Console, the substracted images have a windowing very different with a great center and width.
So I would have the same windowing on my program than on the MRI Console.

If someone has an idea... :-)

Thanks in advance.

Alfredo.


----- Original Message ----- 
From: "Amy Squillacote" <amy.squillacote at kitware.com>
To: "Aldredo Gourbish" <the.answer3 at libertysurf.fr>
Cc: "vtkusers" <vtkusers at vtk.org>
Sent: Wednesday, August 22, 2007 7:03 PM
Subject: Re: [vtkusers] Problem of ScalarType after using vtkImageMathematics


> Hi Alfredo,
> 
> Try using vtkImageShiftScale rather than vtkImageCast. It will allow you 
> to put the data in the correct range for the output scalar type.
> 
> - Amy
> 
> Aldredo Gourbish wrote:
>> Hi everybody !
>>
>> I've got a problem after using vtkImageMathematics in order to subtract 2 vtk volumes.
>> In fact, the result is quiet good when I render it with vtkOpenGLVolumeTextureMapper3D which supports short ScalarType.
>> But when I render the result with vtkOpenGLVolumeTextureMapper2D, it is bad since this mapper only supports UnsignedShort or UnsignedChar ScalarType, and the volume is all white.
>> I saw that in fact the ScalarRange of the vtkImageMathematics result is (-15, 35), so I think there is a problem of ScalarRange for vtkOpenGLVolumeTextureMapper2D. I tried to use a vtkImageCast in order to cast the ScalarType to UnsignedShort but there is always the problem.
>>
>> I hope you understand my problem, and somebody has an idea. I spend a long time searching a solution but with no results !
>>
>> Thanks in advance,
>>
>> Alfredo.
>>
>>
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>>   
> 
> -- 
> Amy Squillacote
> Kitware, Inc.
> 28 Corporate Drive
> Clifton Park, NY 12065
> Phone: (518) 371-3971 x106
> 
>

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