I have today made another change to the way that multiple masks are handled, and I have modified the previous post "Using Multiple Masks" to reflect it.
Previously, multiple masks were always combined by taking the union of the source regions. Now, the intersection of the source regions may instead be used by setting the xxx.ZERO_UNION parameter to zero (i.e. false), where "xxx" is AST, FLT or COM. Note, the default is still to use to use the union.
This can be useful, for instance, if a basic SNR mask allows bright structures to develop near the edges - intersecting the SNR mask with a ZERO_LOWHITS mask will reduce the SNR mask to exclude the edge regions.
Previously, multiple masks were always combined by taking the union of the source regions. Now, the intersection of the source regions may instead be used by setting the xxx.ZERO_UNION parameter to zero (i.e. false), where "xxx" is AST, FLT or COM. Note, the default is still to use to use the union.
This can be useful, for instance, if a basic SNR mask allows bright structures to develop near the edges - intersecting the SNR mask with a ZERO_LOWHITS mask will reduce the SNR mask to exclude the edge regions.
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