Type Conversions · CFITSIO.jl

Type Conversions

The following tables give the correspondances between CFITSIO "types", the BITPIX keyword and Julia types.

CFITSIO Types

CODE	CFITSIO	Julia
	int	`Cint`
	long	`Clong`
	LONGLONG	`Int64`

FITS BITPIX

CODE	CFITSIO	Julia
8	BYTE_IMG	`UInt8`
16	SHORT_IMG	`Int16`
32	LONG_IMG	`Int32`
64	LONGLONG_IMG	`Int64`
-32	FLOAT_IMG	`Float32`
-64	DOUBLE_IMG	`Float64`

CFITSIO Aliases

CODE	CFITSIO	Julia	Comments
10	SBYTE_IMG	`Int8`	written as: BITPIX = 8, BSCALE = 1, BZERO = -128
20	USHORT_IMG	`UInt16`	written as: BITPIX = 16, BSCALE = 1, BZERO = 32768
40	LONG_IMG	`UInt32`	written as: BITPIX = 32, BSCALE = 1, BZERO = 2147483648
80	ULONGLONG_IMG	`UInt64`	written as: BITPIX = 64, BSCALE = 1, BZERO = 9223372036854775808

FITS Table Data Types

CODE	CFITSIO	Julia
1	TBIT
11	TBYTE	`Cuchar`, `UInt8`
12	TSBYTE	`Cchar`, `Int8`
14	TLOGICAL	`Bool`
16	TSTRING	`String`
20	TUSHORT	`Cushort`
21	TSHORT	`Cshort`
30	TUINT	`Cuint`
31	TINT	`Cint`
40	TULONG	`Culong`
41	TLONG	`Clong`
42	TFLOAT	`Cfloat`
80	TULONGLONG	`UInt64`
81	TLONGLONG	`Int64`
82	TDOUBLE	`Cdouble`
83	TCOMPLEX	`Complex{Cfloat}`
163	TDBLCOMPLEX	`Complex{Cdouble}`

CFITSIO.bitpix_from_type — Function

bitpix_from_type(::Type)::Cint

Return the FITS BITPIX code for the given Julia type

Example

julia> CFITSIO.bitpix_from_type(Int64)
64

See also type_from_bitpix

CFITSIO.type_from_bitpix — Function

type_from_bitpix(::Integer)::Type

Return the Julia type from the FITS BITPIX code

Example

julia> CFITSIO.type_from_bitpix(64)
Int64

See also bitpix_from_type

CFITSIO.cfitsio_typecode — Function

cfitsio_typecode(::Type)::Cint

Return the CFITSIO type code for the given Julia type.

Example

julia> CFITSIO.cfitsio_typecode(Int64)
81