Option for disabling Retina, PHP Image Filters

Option for disabling Retina
We can disable the retina because in some cases, the image will  be larger then the max size that a device can handle http://www.williammalone.com/articles/html5-javascript-ios-maximum-image-size/

PHP Image Filters
Now we can add image filters provided by php.
http://php.net/manual/en/function.imagefilter.php
http://www.phpied.com/image-fun-with-php-part-2