Hello,

I'm trying to write a pipeline that

   1. reads an image
   2. passes each band to an instance of a filter
   3. gathers the filter outputs and uses that as an input to a different 
   filter

I'm not really familiar to ITK pipelines, but my approach was to derive 
from itk::ProcessObject, set the outputs from step 1 as inputs to this 
filter and use the computed values in GenerateData(). However, at that 
point the inputs don't seem to have been computed yet.


A workaround is to manually call Update() in step 2, but that's probably 
less efficient.


Does anyone have some tips on how to do this? My code looks like this: 
https://gist.github.com/lnicola/1710d79e4f129e02528e4c4149f8047d


Thanks,

Laurentiu Nicola

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