#!/bin/bash
#  mod_img.sh
#  Install dependencies:  sudo  apt install imagemagick
#  Usage:  mod_img.sh inputfile outputfile

strength=30

blocksize=$(( RANDOM % 20 + 30 ))
angle=$(( RANDOM % 90 ))
scale=$(( 100 / blocksize ))
str=$(( 100 - strength ))
size=$(convert "$1" -format "%[w]x%[h]" info:)

echo Strength: $strength, Blocksize: $blocksize, Angle: $angle
convert "$1" -scale $scale% +noise Poisson -scale $size -distort SRT $angle "$1" -compose Blend -define compose:args=$str -composite "$2"

#Stand alone command for reference
#  convert input.jpg -scale 5% +noise Poisson -scale 2000% input.jpg -compose Blend -define compose:args=85 -composite output.jpg