Hi I am currently checking the resolution of images in Photoshop to make sure they can be printed on large wall sizes of 5m and 6m. I have always been told that for print images at 300 dpi have a great resolution. Recently when printing a banner with a 9ft drop the resolution was 9dpi. The printer sent me a test sample and it was perfect. The image size was huge and contained a large number of pixels but I always have that moment of panic when a tight deadline hits and the job needs signed off and I have lots of images to check. I am looking to see if there is anything on the market which can tell me the maximum size I can use an images at? (or tell me instantly if what I have been sent through is not usable beyond a certain size.) Thank you in advance.