To optimise your images you’ll need to consider the final size your images will be used at. Photographs and images should be 300dpi at the size you are going to use them.

72dpi images are used for the web but will not print well. It’s important when you’re purchasing or using an image to think of the end result and if it’s going to be used for both web and print buy a 300dpi image and resize it for the web and not the other way around!

There’s no point taking a postage stamp sized image at 300dpi and then blowing it up to a A4 size. Conversely, photographs at more than 350dpi will have no effect on the actual printed quality and will unnecessarily increase file size and processing time.