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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:

        #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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