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#!/bin/bash
#Description:
#This hides an image within an image as an overlay. Useful for watermarking images.
#1 is foreground
#2 is background
#3 is output
#gemsize is an env var for dictating how big or small the overlayed photo should be
#TMPDIR is an env var for dictating where temporary files for this program should be stored
#Axioms:
#Dependencies: https://packages.debian.org/sid/imagemagick
if [ "$TMPDIR" = "" ]
then
TMPDIR=/tmp
fi
rotation=$(echo "$RANDOM%360"|bc)
#widthforeground=$(identify -format "%[fx:w]" "/home/$USER/Pictures/wojak/soy/5486*")
#heightforeground=$(identify -format "%[fx:h]" "/home/$USER/Pictures/wojak/soy/5486*")
widthbackground=$(identify -format "%[fx:w]" "$1")
heightbackground=$(identify -format "%[fx:h]" "$1")
if [ "$gemsize" = "" ]
then
foregroundresizefactor=$(echo "$heightbackground*0.15"|bc)x
else
foregroundresizefactor=$(echo "$heightbackground*$gemsize"|bc)x
fi
foregroundLegalMovingDistanceWidth=$(echo "$widthbackground/2"|bc)
foregroundLegalMovingDistanceHeight=$(echo "$heightbackground/2"|bc)
foregroundActualMovingDistanceWidth=$(echo "$RANDOM%$foregroundLegalMovingDistanceWidth"|bc)
foregroundActualMovingDistanceHeight=$(echo "$RANDOM%$foregroundLegalMovingDistanceHeight"|bc)
if [[ $(echo "$RANDOM%2"|bc) == 0 ]]
then
foregroundActualMovingDistanceWidth=-$foregroundActualMovingDistanceWidth
fi
if [[ $(echo "$RANDOM%2"|bc) == 0 ]]
then
foregroundActualMovingDistanceHeight=-$foregroundActualMovingDistanceHeight
fi
convert "$2" -alpha set -background none -colorspace RGB -trim -rotate "$rotation" -fuzz 10% -transparent White -resize "$foregroundresizefactor" -trim "$TMPDIR/trans.png"
composite -dissolve 70% -gravity center -geometry +"$foregroundActualMovingDistanceWidth"+"$foregroundActualMovingDistanceHeight" "$TMPDIR/trans.png" "$1" "$3"
rm "$TMPDIR/trans.png"
echo "$(identify -ping -format '%[width]' "$3")*0.5"|bc
echo "$(identify -ping -format '%[height]' "$3")*0.5"|bc
finalwidth=$(echo "$(identify -ping -format '%[width]' "$3")*0.5"|bc)
finalheight=$(echo "$(identify -ping -format '%[height]' "$3")*0.5"|bc)
xlocation=$(echo "$finalwidth-$foregroundActualMovingDistanceWidth"|bc)
ylocation=$(echo "$finalheight-$foregroundActualMovingDistanceWidth"|bc)
echo "hidden gem is at ($xlocation, $ylocation)"
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