I've been asked to do a PowerPoint slide background template. Question is, what size do I need to do it to? What I need to know is: Are all PowerPoint slides produced to the same size/proportions? For instance, I can open PowerPoint, open a slide, scaled at 100%, grab the screen, open it in PhotoShop and use it as a guide for size - but does that solve the issue? What I don't want to do is create an image that is going to be squeezed or stretched or shown at a lower resolution than it's supposed to be. Any thoughts?..