THESE CODES ARE PROVIDED FOR AN EXAMPLE OF HOW TO USE IMAGEMAGICK WITH PHP. CARE SHOULD BE TAKEN WHEN ACCEPTING USER INPUT.
I TAKE NO RESPONSABILTY FOR ANY PROBLEMS THAT MAY OCCURE WHEN USING ANY OF THIS CODE.
IT IS UP TO YOU TO SECURE THE CODE AND VALIDATE USER INPUT.
Original image on the left ( or top ) and modified Image on the right ( or bottom )
exec("convert House.jpg -fill black -colorize 15% colorize.png");
exec("convert House.jpg -contrast-stretch 2% stretch.png");
exec("convert House.jpg -level 5%,95%,0.8 level.png");