[Insight-users] pixeltype

[Luis Ibanez]

Hi Jesse,

The reason is that the original data in the RatLung files
is using a pixel type with 8 bits.

When you load it as unsigned short, the data is promoted
to 16 bits, but still only occupying the lower 8 bits,
because the reades do default C-language casting and do
not perform any intensity rescaling.

In other words, the real dynamic range of this data is
always 8 bits regardless of whether you read it in 8 bits
or 16 bits pixel types.



   Regards,


      Luis



--------------
Jesse wrote:

> Hi,all
> 
>  
> 
> In 2d demons registration, pixeltype of RatLungSlice is unsigned char, 
> but in line 108 of DeformableRegistration2.cxx:
> 
>  
> 
>   typedef unsigned short PixelType;
> 
>  
> 
> I found the result is the same, whether using unsigned short or unsigned 
> char. Why?
>  
> Bests
>  
> Jesse
>