However the above has some problems. If a jpg image for example , is 5000px x 5000px then imagecreatefromjpg would uncompress it and use a large amount of memory (5000 x 5000 pixels) to store it. This memory is taken from RAM or the memory allocated to php. The amount of memory needed in uncompressed form can easily go upto several hunder MBs which is much higher than what php normally has. And then memory exceeded error might be thrown depending on how much memory is available to php.