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Image FITS Values
=================
When a FITS header is scanned in memory or read from a file several
image values are retrieved from the header and stored in s #FITSImage
structure. This structure may be accesed with the following macros:
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##define #ft_hasbscale(fits) ( fits->image->has_bscale )
##define #ft_bscale(fits) ( fits->image->bscale )
##define #ft_hasbzero(fits) ( fits->image->has_bzero )
##define #ft_bzero(fits) ( fits->image->bzero )
##define #ft_hasblank(fits) ( fits->image->has_blank )
##define #ft_blank(fits) ( fits->image->blank )
typedef struct #FITSImage {
int has_bscale;
int bscale;
int has_bzero;
int bzero;
int has_blank;
int blank;
} #"*FITSImage";
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