[Insight-users] PixelType Doubt

[Shekhar Chandra]

  Hi Daniela,

You would use unsigned char for 8-bit greyscale images, i.e. with a max 
value of 255. This would be a B/W image as an 8-bit image has one 
channel. RGB has three 8-bit values, red, green, blue.

Unsigned shorts are used for 16-bit images, such as 16-bit TIFFs. If you 
have signed values, you could use the float type. You can convert 
between types using the CastImageFilter.

HTH
Cheers
Shakes

On 9/09/2010 5:26 PM, Daniela Sacchetto wrote:
> Hi everyone,
> I'm writing because I have a question for you.
> Could anyone explain me how can I decide the itk::PixelType? Usually I 
> work with unsigned short pixels, but now I would like to understand 
> better this problem.
>
> For ex I know that:
>
> PixelType must be "signed" for CT since Hounsfield units can be < 0.
>
> Are there any rules for each medical image? (TC,PET,US,RX,...)
> And when do you use pixelType = unsigned char?
>
> Thanks all for your help,
> Regards
> Daniela
>
>
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