The image below shows how pixels are used to form an image. Each of these dots is a single colour and the number of dots affects the file size of the picture. A raster or bitmap picture (contrary to a vector image) is made up of thousands of tiny dots or pixels. OK, so this might not be the most exciting news headline but we need to start from the beginning. So what do presentation professionals need to know about picture size and resolution? Pictures are made of dots But when it comes to PowerPoint, there’s an odd mix of measurements from the physical and digital worlds even though the majority of what is produced is shown on either a monitor or a projector.
If you come from a web design environment you might be more familiar with pixels. If you come from a print media background you’ll be familiar with the importance of image resolution and how it affects quality.
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