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phits's Issues

Metadata leak

Currently, Phits leaks the copy of FITS metadata that is associated with an opened FITS file.

Determine if/how the plugin can determine that a previously-imported image has been closed, at which point the metadata could be safely deleted.

Preserve keyword ordering

Keyword order is not preserved when a FITS file is read, and then saved.

The loss of ordering is due to the fact that CCfits stores keywords in a map, which results in them being iterated over in alphabetical order on save.

Non-structural keywords should maintain their ordering, as related keywords are often grouped sequentially.

Additional normalization options

Currently, out-of-range floating-point data is always normalized by mapping [min,max] to [0,1].

This is a reasonable default, but other options should be presented to the user at FITS read time.

For example, the CWHITE and CBLACK values, if present, could be used to set the white and black points.

PEDESTAL could also be presented in an option to transform ADU data.

Phits could also attempt to compute reasonable default black/white points through some simple histogram binning.

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