skymask

pydl.pydlspec2d.spec1d.skymask(invvar, andmask, ormask=None, ngrow=2)

Mask regions where sky-subtraction errors are expected to dominate.

Parameters:

invvar : numpy.ndarray

Inverse variance.

andmask : numpy.ndarray

An “and” mask. For historical reasons, this input is ignored.

ormask : numpy.ndarray, optional

An “or” mask. Although technically this is optional, if it is not supplied, this function will have no effect.

ngrow : int, optional

Expand bad areas by this number of pixels.

Returns:

numpy.ndarray

The invvar multiplied by the bad areas.