yup, thats what i meant :)
alternatively, u may just create 1 image of 35 by 45 mm then save it to ur thumbdrive. most studios have their own software of printing pp photos by selecting an image.
4R = 6 by 4 inches
therefore, if you use photoshop to create a 4R canvas, you can only fit 8 passport-size images on it.
from the previous posts, pp size shld be 35mm(w) by 45mm(l).
i assume you are going to print it from a studio???