Raster images are generally used for photography or illustrations that have been scanned, or photos from cameras and phones that work with a raster-based program like photoshop. This is why it is recommended to use a high dpi like 300 at size as to get a quality image. The result will be an image where you can clearly see the pixels and no fine detail.
If you take a 72 dpi image and scale it up 300%, you will not increase the number of pixels or dots of that image, you will simply increase the size of each pixel or dot. The number of pixels that comprise a raster image is called the resolution and it is fixed. A 72 dpi image is made of 72 dots-per-inch (dpi) or 72 pixels (ppi) in every inch of that image. RasterĪ raster image is made of a collection of dots called pixels. But first, you have to understand the difference between a Raster image and a Vector image. Here is a guide to help you choose which digital image format to use. Whether you’re designing a PowerPoint presentation, a brochure or a website, chances are you’ll need to include photographs, illustrations, figures or charts.
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