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Filter Selection Criteria
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Chooses how a filter keyword may be used to create
a single output flat or a set of output flats for different
filters. Although an Illumination Flat is usually intended to
represent variations independent of wavelength, use this feature to
control the selection of raw images for creating the output flats.
The 3 options are as follows:
1. Select all flats without choosing a
filter: Creates a single output flat by ignoring possible
filter differences among the source images.
2. Select only flats that match a single
filter: Creates a single output flat using only source images
having a specific value of the filter keyword. In this case, both
the name of the filter keyword and the target filter value must be
specified, for example, Filter Keyword = FILTER and Filter Name = R.
3. Create a library of flats for different
filters: Creates one or more output flats by combining only
flats having the same value of the filter keyword. For example, if
the source images use B, V, and R filters, this option would create
separate output flats for the B, V, and R filters. The value of the
filter keyword for each group is appended to the base name as the
name of the output flat, for example, MasterFlat_B.fts.
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Filter Keyword
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Specify the name of the filter keyword in the raw
flat frames. When Filter Selection
Criteria options 2 and 3 are selected, this property
specifies the name of the filter keyword. Typically, this is the
FITS format standard FILTER, although
any keyword may be used.
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Filter Name
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Specified the value of the Filter keyword in the
raw flat frame. When Filter Selection
Criteria option 2 is selected, this property specifies the
filter name encoded in the Filter keyword. For example, if the
images use FILTER = 'R', then this
property would be set to R.
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Select individual flats
using the signal range