php memory_limit = 1024M在RAM中占用1024MB

I have a Symfony2 application where I am uploading photos and resizing etc. on upload using LIIPImaginebundle.

Due to the need for very large photos to be uploaded I have increased the memory_limit to 1024M but there are still larger images (eg 96Megapixel) that are being rejected.

My question is by upping the amount of memory_limit does it equate to that exact amount in ram on the server. therefore if 10 people at the same time upload these large files, would 10 x 1024 be taken up eg 10GB??