/usr/bin/light_correct is in libvips-tools 8.4.5-1build1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 | #!/bin/sh
# correct a set of files for illumination errors
# usage:
#
# example% light_correct grey.v im1.v im2.v
#
# writes output images ic_im1.v and ic_im2.v
# default prefix
VIPSHOME=${VIPSHOME-/usr}
# get name we were run as
name=$0
bname=`basename $name`
# names of our temp files
t1=light_correct_temp1
t2=light_correct_temp2
# check args
if [ $# -lt 2 ]; then
echo "${bname}: usage: $bname <grey> <image1> <image2> ..."
exit 1
fi
echo "Preparing grey ..."
grey=$1
shift
# find image size
width=`$VIPSHOME/bin/vips im_header_int Xsize $grey`
height=`$VIPSHOME/bin/vips im_header_int Ysize $grey`
# smooth the grey out
$VIPSHOME/bin/vips im_shrink $grey $t1.v 20 20
$VIPSHOME/bin/vips im_resize_linear $t1.v $t2.v $width $height
# and make the correction image
mean=`$VIPSHOME/bin/vips im_avg $t2.v`
$VIPSHOME/bin/vips im_powtra $t2.v $t1.v -1
$VIPSHOME/bin/vips im_lintra $mean $t1.v 0 $t2.v
# grey correct images in order
for i in "$@"; do
echo "Correcting $i as ic_$i ..."
$VIPSHOME/bin/vips im_multiply $t2.v "$i" $t1.v
$VIPSHOME/bin/vips im_clip $t1.v "ic_$i"
# remove the .desc as well
name=`echo $name | sed -e 's/\.[^\.]*//'`
/bin/rm -f "ic_$name.desc"
done
# more cleanup
echo "Cleaning up ..."
/bin/rm -f $t1.v $t1.desc
/bin/rm -f $t2.v $t2.desc
|