Hi all, I am not a designer or digital image expert so bear with me, please. I need to prepare and print a poster containing text and images (not pictures but technical stuff like colored 3D surfaces and contour maps). Keynote and Powerpoint are my preferred choices due time limitations. I will create the design using one of them and then export to a PDF file. Here is the problem. This time my poster size will be 4 ft X 6 ft which exceeds both Powerpoint and Keynote size limitations (I remember Powerpoint having a max slide size around 54 inches). The solution I heard was to prepare the poster using HALF of the final size (ie, 2ft X 3ft) and then expand it by 200% at the end. Here lies my concern. How bad will be the image degradation after this expansion ? Which resolution should the images have in order to have a decent result after the expansion ? I know that everyone has a different opinion about the term "decent result" but anything with minimum granulation will be fine. Most of images on this poster have the same size (half of a letter sheet). The biggest one will occupy the space of two sheets (letter size) side-by-side. I really appreciate any comments !!!