I have put together a large display case backdrop roughly 7'x4' with 200 resolution in photoshop which is now 21gb and it will not save! I tried compressing and saving as a tiff but it takes hours and has yet to be successful. I have roughly 50 greyscale linked images all with layer masks evenly placed with a colour overlay not very complicated. The only way I can save is deleting sections saving that then puzzling it back together later then trying to export as a tiff again. Any help would be greatly appreciated!