I may need to upsize some images to be used for a large vehicle wrap. The images will need to be provided to the printer already upsized to the final dimensions, which will be 23' x 11'. I have done a trial upsizing to those dimensions in one step using Photoshop, at 300ppi, 150ppi and 75ppi, and they all look fine to me (really no difference at print size) for this application. Since the intended normal viewing distance is not at close range, I wonder if this process will suffice, or if I should use some other technique or software to do the upsizing. Any suggestions from people who have actually upsized photos for this application? I mean specifically for large vehicle wraps, since, unlike billboards, it is possible to view the images at close range, even if that does not give the intended effect, which can only be perceived a greater distances.