Problem with "other" storage.

Hi, i need some help with the clear problem i have with my storage. If someone can help reduce the size of the other section it would be great. I have read through many threads gone though the steps recommended to no avail.(run first aid on disk utility, cleared caches, restart mac, etc.

After running OmniDisk sweeper i discovered the iPhoto Library and Photo Library files are apparently huge, nor do they relate to the suggested file sizes in disk utility. I have read that this number possibly doesn't depicted the actually size of the files? What is the Photos Library.photolibrary_prepare file? i have also run Oynx and cleared the various caches, temp files, etc using the automation function. Thanks for any help, Toby