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# IMHV1.H -- Version 1 of the OIF binary file header (April 1988).
define V1_MAGIC "imhdr" # file identification tag
define V1_PMAGIC "impix" # file identification tag
define V1_VERSION 1 # header version number
define SZ_V1IMPIXFILE 79 # name of pixel storage file
define SZ_V1IMHDRFILE 79 # name of header storage file
define SZ_V1IMTITLE 79 # image title string
define SZ_V1IMHIST 511 # image history record
define SZ_V1BUNIT 9 # brightness units string
define SZ_V1CTYPE 9 # coord axes units string
# The IMIO image header structure.
# Parameters.
define LEN_V1IMHDR 513 # length of std header
define LEN_V1PIXHDR 183 # length of pixel file header
define V1U LEN_V1IMHDR # offset to user fields
define IM_V1USERAREA (P2C($1+V1U)) # user area (database)
# Disk resident header.
define IM_V1MAGIC Memi[$1] # contains the string "imhdr"
define IM_V1HDRLEN Memi[$1+3] # length of image header
define IM_V1PIXTYPE Memi[$1+4] # datatype of the pixels
define IM_V1NDIM Memi[$1+5] # number of dimensions
define IM_V1LEN Meml[$1+$2+6-1] # length of the dimensions
define IM_V1PHYSLEN Meml[$1+$2+13-1] # physical length (as stored)
define IM_V1SSMTYPE Meml[$1+20] # type of subscript mapping
define IM_V1LUTOFF Meml[$1+21] # offset to subscript map luts
define IM_V1PIXOFF Meml[$1+22] # offset of the pixels
define IM_V1HGMOFF Meml[$1+23] # offset of hgm pixels
define IM_V1BLIST Meml[$1+24] # offset of bad pixel list
define IM_V1SZBLIST Meml[$1+25] # size of bad pixel list
define IM_V1NBPIX Meml[$1+26] # number of bad pixels
define IM_V1CTIME Meml[$1+27] # time of image creation
define IM_V1MTIME Meml[$1+28] # time of last modify
define IM_V1LIMTIME Meml[$1+29] # time min,max computed
define IM_V1MAX Memr[P2R($1+30)] # max pixel value
define IM_V1MIN Memr[P2R($1+31)] # min pixel value
define IM_V1HGM ($1+33) # histogram descriptor
define IM_V1CTRAN ($1+52) # coordinate transformations
define IM_V1PIXFILE Memc[P2C($1+103)] # name of pixel storage file
define IM_V1HDRFILE Memc[P2C($1+143)] # name of header storage file
define IM_V1TITLE Memc[P2C($1+183)] # image name string
define IM_V1HISTORY Memc[P2C($1+223)] # 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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