![]() Vector images are made up of many individual, scalable objects. For more in-depth information about resolution, scanning, and printing bitmap images, refer to my article Getting Started Scanning. If you've ever wondered why your 300 dpi scanned image appears so much larger on your monitor, this is why. In order to render a raster image accurately, the typical desktop printer needs 150-300 ppi. However, when printing rasters, your printer needs much more image data than a monitor. Raster images are displayed on your computer screen at screen resolution: approximately 100 ppi. Resolution refers to the number of pixels in an image and is usually stated as dpi (dots per inch) or ppi (pixels per inch). Most computer monitors display approximately 70 to 100 pixels per inch-the actual number depends on your monitor and screen settings. All these tiny dots of color come together to form the images you see. ![]() Pixels are picture elements tiny dots of individual color that make up what you see on your screen. Raster images (also known as bitmap images) are made up of pixels in a grid. Here is some detailed information on the differences between the two formats to help clarify why that is. However, when it comes to print, vector images are prefered when it comes to maintaining the best print quality possible. Raster images are much more commonly used as they have been around longer, and are useful for a wide variety of purposes. Image files come in two main varieties, Vector Images and Raster (bitmapped) Images.
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