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Image pipeline improvements for batch processing/multi-image filters

description

Filters such as watermarking and masking will need to access the other images in the pipleline.
 
Can either:
  • Just set the watermark or mask image in the constructor of the filter
  • Pass in the watermark image in a different 'channel' which can somehow be accessed by the filter
     
    Will need the concept of channels for batch processing anyway, and we could extend this to include channels which are 'dumb' (no processing is done on images in these channels) or 'active' (full filter processing is done). This way, filters can use other images as part of their processing.

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