Modify image contrast and colours
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<?php exec("convert House.jpg -fill black -colorize 15% colorize.png"); ?>
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<?php exec("convert House.jpg -contrast-stretch 2% stretch.png"); ?>
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<?php exec("convert House.jpg -level 5%,95%,0.8 level.png"); ?>
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<?php exec("convert House.jpg -normalize normalize.png"); ?>
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<?php exec("convert House.jpg -sigmoidal-contrast 3,75% sigmoidal.png"); ?>
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