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FITS HDU image: no bijection between TFORMn value (L, A, B, J, K, ..) and BITPIX #61

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JulienPeloton opened this issue Nov 15, 2018 · 0 comments
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FITS HDU image: no bijection between TFORMn value (L, A, B, J, K, ..) and BITPIX #61

JulienPeloton opened this issue Nov 15, 2018 · 0 comments
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In the Image HDU header, there is no mention of the data type via TFORMn value (letters: L, K, J, ...). Instead, the number of bits used per image pixel is given (BITPIX).

But looking at Table 18 from FITS standard, there is no one-to-one correspondence... For example, a BITPIX of 8 could be either B (unsigned byte) or L (Boolean).

How to choose then?
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