[Insight-users] ShiftscaleImageFilter

[Luis Ibanez]

Hi Radhika,

You could also use the
IntensityWindowingImageFilter for this purpose.

http://www.itk.org/Insight/Doxygen/html/classitk_1_1IntensityWindowingImageFilter.html

Inversion with this filter is achieved by setting

   WindowMinimum =   0
   WindowMaximum = 255
   OutputMinimum = 255
   OutputMaximum =   0


Regards


    Luis


--------------------------------
Radhika Sivaramakrishna wrote:

> Hi
> 
> I was trying to invert an image using shift scale image filter. But 
> looks like I am making a mistake because I get a blank image.
> 
> I have an unsigned char image. Here is what I am doing
> 
>  
> 
> ShiftScaleFilterType::Pointer ssfilter1 = ShiftScaleFilterType::New();
> 
> ssfilter1->SetInput(mask);
> 
> ssfilter1->SetShift(-255.0);
> 
> ssfilter1->SetScale(-1.0);
> 
>  
> 
> I put the shift factor as -255, because I checked the code for 
> ShiftScale... and it calculates the new values as (old_value + 
> shift)*scale, unless I am misinterpreting this.
> 
> Can someone help me figure out where I am making a mistake?
> 
> Thanks
> 
> Radhika
> 
>  
> 
>  
> 
>  
> 
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