This Friday, AppForce.One has released a new version of Picture Tiler. This version can handle larger pictures, by making use of virtual memory. It is now possible to load images up to over 65000 pixels wide/tall. Previous versions of Picture-Tiler were unable to load pictures larger than 4GB, whilst the current version easily loads pictures over 6GB. Loading files is about as fast as PhotoShop. Picture Tiler is available in the Mac App Store.
Follow this link for more information.