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.help imgs Sep86 imfort
.ih
NAME
.nf
imgs -- get (read) an image section
.fi
.ih
SYNOPSIS
.nf
subroutine imgs1r (im, rbuf, i1,i2, ier)
subroutine imgs1s (im, sbuf, i1,i2, ier)
subroutine imgs2r (im, rbuf, i1,i2, j1,j2, ier)
subroutine imgs2s (im, sbuf, i1,i2, j1,j2, ier)
subroutine imgs3r (im, rbuf, i1,i2, j1,j2, k1,k2, ier)
subroutine imgs3s (im, sbuf, i1,i2, j1,j2, k1,k2, ier)
integer im #I image descriptor of open image
real rbuf(*) #O output pixel buffer, type real
integer*2 sbuf(*) #O output pixel buffer, type short
integer i1, i2 #I range of columns to be extracted
integer j1, j2 #I range of lines to be extracted
integer k1, k2 #I range of bands to be extracted
integer ier #O status return
.fi
.ih
DESCRIPTION
The \fIimgs\fR procedures are used to get a section (subraster) from an image.
Procedures are provided for images of from one to three dimensions,
of pixel type short integer or real. The type real procedures may be
applied to images of either type, but the type short procedures may only
be used to access images of type short. The output buffer must provide
space for at least (i1-i2+1) pixels (\fIgs1\fR), ((j2-j1+1) * (i2-i1+1)) pixels
(\fIgs2\fR), or ((k2-k1+1) * (j2-j1+1) * (i2-i1+1)) pixels (\fIgs3\fR).
The pixels are returned in Fortran storage order. The column index \fIi2\fR
must be greater than or equal to \fIi1\fR, but the remaining subscripts may
be swapped if desired.
.ih
RETURN VALUE
A zero status is returned if the referenced image section is in-bounds and
the actual pixel datatype of the image is one of the types permitted by
the particular operator called.
.nf
IE_NOTSHORT: imfort short integer i/o requires a type short image
IE_PIXTYPE: image pixel type must be short or real
IE_RDPIX: error reading image pixel file
IE_XOOB: image x coordinates out of range or out of order
IE_YOOB: image y coordinates out of range
IE_ZOOB: image z coordinates out of range
.fi
.ih
SEE ALSO
imps, imgl, impl
.endhelp
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