Hello Im studying Fashion Photography and i have been asked to do a research folder including a 24 sheets poster. However I don't really know where to search informations about how to do it. I need to know how to present this file digitally. Resolution, dpi... all this stuff. I will shoot it in studio with a camera that will do the trick, i just need to know how to present it as a digital file. As it needs to be 24 sheets of A4 my logical was to do so : A4 = 210x297 cm 210x3 = 630 297x8 = 2376 SO the billboard size is 630x2376 cm And then i was thinking about : 630/10 = 63 2376/10 = 237,6 63x237,6 at 300 dpi ? i am terrible at maths and i don't understand anything about resolution for big prints. If anyone could help on this I'd be grateful.