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.help imgkw Sep86 imfort
.ih
NAME
imgkw -- get the value of an image header keyword
.ih
SYNOPSIS
.nf
subroutine imgkwb (im, keyw, bval, ier)
subroutine imgkwc (im, keyw, cval, ier)
subroutine imgkwi (im, keyw, ival, ier)
subroutine imgkwr (im, keyw, rval, ier)
subroutine imgkwd (im, keyw, dval, ier)
integer im #I image descriptor of open image
character*(*) keyw #I name of the keyword to be set
integer ier #O status return
logical bval #O logical (boolean) keyword value
character*(*) cval #O character string keyword value
integer ival #O integer keyword value
real rval #O real keyword value
doubleprecision dval #O double precision keyword value
.fi
.ih
DESCRIPTION
The \fIimgkw\fR procedures are used to get the values of image header keywords.
Automatic datatype conversion is provided, hence the datatype requested need
not be an exact match to the actual datatype of the keyword.
.ih
RETURN VALUE
A zero status is returned if the named keyword exists and if the datatype
coercion implied is permissible.
.nf
SYS_IDBKEYNF: image header keyword not found
SYS_IDBTYPE: illegal header parameter data type conversion
.fi
.ih
SEE ALSO
impkw, imaddk, imacck
.endhelp
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