Basic Information on vblank

Task: vblank
Purpose: Masks outlier pixels in velocity space
Categories: image-analysis

vblank takes a cube that's already been masked and masks it further, 
so that unmasked pixels that are surrounded by only masked pixels 
along axis 1 will be masked.  The default is to mask if both adjacent 
pixels are masked; one can increase the window size with keyword 'tol'.

This can be useful to reduce noise in a datacube that has already 
been masked with a smoothed cube and where the velocity field is 
assumed to be smooth.  In this case axis 1 would be the velocity axis
and spikes far from the channels of actual emission are masked.

NOTE: Because flagging is only implemented for planes, the velocity
axis must be axis 1.  Use REORDER first to make this so.
      reorder in=file1 out=file2 mode='312'
      vblank in=file2
      reorder in=file2 out=file3 mode='231'

Key: in
This is the standard name for an input dataset -- usually
an image, though sometimes either an image or visibility dataset
or some foreign dataset format. Some tasks support multiple
input datasets at a time (with wildcard supported) whereas
others can handle only a single one at a time. There is
generally no default input name.

Key: tol
How far (in pixels) the nearest unmasked pixel can be for the given 
pixel to stay unmasked.  Default is 1.

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