The formats of ASCII table columns and binary table columns are inherently incompatible in FITS. They don't support the same ranges and types of values, and even reuse format codes in subtly different ways. For example the format code 'Iw' in ASCII columns refers to any integer whose string representation is at most w characters wide, so 'I' can represent effectively any integer that will fit in a FITS columns. Whereas for binary tables 'I' very explicitly refers to a 16-bit signed integer.
Conversions between the two column formats can be performed using the to/from_binary
methods on this class, or the to/from_ascii
methods on the _ColumnFormat
class. But again, not all conversions are possible and may result in a :None:None:`ValueError`.
Similar to _ColumnFormat but specifically for columns in ASCII tables.
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