[Insight-users] Do ImageToImageFilter subclasses copy meta-information to output by default?

[Karthik Krishnan]

Hi Zach,

Update calls consists of 3 stages one of which is to update the output
information: UpdateOutputInformation(). 

The implementation of UpdateOutputInformation() in most subclasses of
DataObject (at least ImageBase) calls the ProcessObject's (the process
object that was responsible for generating this data object)
UpdateOutputInformation() method. 

Since the process object connects two data objects, it is able to pass
meta-information from the input data object to the output. This is done
in in the ProcessObject's GenerateOutputInformation() method.
	output->CopyInformation(input);

You don't have to do this on a per filter level unless your
meta-information needs to be different.

-karthik

On Fri, 2005-06-24 at 19:00 -0700, Zachary Pincus wrote:
> I feel like I ought to know this, but do ImageToImageFilter subclasses 
> by default copy the input's meta-information (origin, spacing) and all 
> region information to the output, or does this have to be done on a 
> per-filter level?
> 
> A quick look through the code didn't clarify things for me 
> unfortunately.
> 
> Thanks,
> 
> Zach
> 
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