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# IMHDR.H -- Image Header Definitions. The structure definitions in this file
# assume two or less chars per struct unit (e.g., a one or two byte char).
define IM_MAXDIM 7 # maximum dimension of image
define SZ_IMMAGIC 5 # used to verify structure
define SZ_IMPIXFILE 255 # name of pixel storage file
define SZ_IMHDRFILE 255 # name of header storage file
define SZ_IMTITLE 383 # image title string
define SZ_IMHIST 1023 # image history record
define SZ_BUNIT 9 # brightness units string
define SZ_CTYPE 9 # coord axes units string
define IMH_MAGICSTR "imhdr" # file identification string
define PIX_MAGICSTR "impix" # file identification string
# The IMIO image header structure.
# Parameters.
define LEN_IMDES 200 # length of image descriptor
define LEN_IMHDR 1024 # length of std header
define IMD LEN_IMDES # offset to std header fields
define IMU (LEN_IMDES+LEN_IMHDR) # offset to user fields
define IM_USERAREA (P2C($1+IMU)) # user area (database)
# Disk resident header.
define IM_MAGIC Memi[$1+IMD] # contains the string "imhdr"
define IM_HDRLEN Memi[$1+IMD+3] # length of image header
define IM_HDRVER Memi[$1+IMD+4] # image format version
define IM_PIXTYPE Memi[$1+IMD+5] # datatype of the pixels
define IM_SWAPPED Memi[$1+IMD+6] # pixels are byte swapped
define IM_NDIM Memi[$1+IMD+7] # number of dimensions
define IM_LEN Meml[$1+IMD+$2+8-1] # length of the dimensions
define IM_PHYSLEN Meml[$1+IMD+$2+15-1] # physical length (as stored)
define IM_SSMTYPE Meml[$1+IMD+22] # type of subscript mapping
define IM_LUTOFF Meml[$1+IMD+23] # offset to subscript map luts
define IM_PIXOFF Meml[$1+IMD+24] # offset of the pixels
define IM_HGMOFF Meml[$1+IMD+25] # offset of hgm pixels
define IM_BLIST Meml[$1+IMD+26] # offset of bad pixel list
define IM_SZBLIST Meml[$1+IMD+27] # size of bad pixel list
define IM_NBPIX Meml[$1+IMD+28] # number of bad pixels
define IM_CTIME Meml[$1+IMD+29] # time of image creation
define IM_MTIME Meml[$1+IMD+30] # time of last modify
define IM_LIMTIME Meml[$1+IMD+31] # time min,max computed
define IM_MAX Memr[P2R($1+IMD+32)] # max pixel value
define IM_MIN Memr[P2R($1+IMD+33)] # min pixel value
define IM_PIXFILE Memc[P2C($1+IMD+37)] # name of pixel storage file
define IM_HDRFILE Memc[P2C($1+IMD+165)] # name of header storage file
define IM_TITLE Memc[P2C($1+IMD+293)] # image name string
define IM_HISTORY Memc[P2C($1+IMD+485)] # history comment string
# The Histogram structure (field IM_HGM)
define LEN_HGMSTRUCT 20
define HGM_TIME Meml[$1] # time when hgm was computed
define HGM_LEN Meml[$1+1] # number of bins in hgm
define HGM_NPIX Meml[$1+2] # npix used to compute hgm
define HGM_MIN Memr[P2R($1+3)] # min hgm value
define HGM_MAX Memr[P2R($1+4)] # max hgm value
define HGM_INTEGRAL Memr[P2R($1+5)] # integral of hgm
define HGM_MEAN Memr[P2R($1+6)] # mean value
define HGM_VARIANCE Memr[P2R($1+7)] # variance about mean
define HGM_SKEWNESS Memr[P2R($1+8)] # skewness of hgm
define HGM_MODE Memr[P2R($1+9)] # modal value of hgm
define HGM_LCUT Memr[P2R($1+10)] # low cutoff value
define HGM_HCUT Memr[P2R($1+11)] # high cutoff value
# next available field: ($1+12)
# The Coordinate Transformation Structure (IM_CTRAN)
define LEN_CTSTRUCT 50
define CT_VALID Memi[$1] # (y/n) is structure valid?
define CT_BSCALE Memr[P2R($1+1)] # pixval scale factor
define CT_BZERO Memr[P2R($1+2)] # pixval offset
define CT_CRVAL Memr[P2R($1+$2+3-1)] # value at pixel
define CT_CRPIX Memr[P2R($1+$2+10-1)] # index of pixel
define CT_CDELT Memr[P2R($1+$2+17-1)] # increment along axis
define CT_CROTA Memr[P2R($1+$2+24-1)] # rotation angle
define CT_BUNIT Memc[P2C($1+31)] # pixval ("brightness") units
define CT_CTYPE Memc[P2C($1+36)] # coord units string
# next available field: ($1+41)
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