Raster images have a certain amount of pixels within each inch. Your image must be at least 2880 pixels wide.Ĭan we enlarge the pixel dimension and resolution of a raster image? If a printer requires a minimum of 240 dpi and you want to print an image in an area that is 12 inches wide, multiply 240 pixels x 12 inches (240 x 12 = 2880). Your image must be at least 1500 pixels wide. If a printer requires a minimum of 300 dpi and you want to print an image in an area that is 5 inches wide, multiply 300 pixels x 5 inches (300 x 5 = 1500). Multiply the resolution required by the area to be printed.
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How to determine what size your raster image must be, for good quality printing: Large format printers (banners, billboards) vary a lot because it also depends on the distance from which the sign is going to be viewed - could be as low as 20 or more than 200 Some screen printers (t-shirts, cloth) require a minimum of 240 dpi Some offset printers (paper printers) require a minimum of 300 dpi The pixel resolution: dots-per-inch (dpi) required by the specific printer How large a raster image can be printed - and maintain quality - depends on 2 things: When we see an image on a 72 dpi monitor, we are seeing 72 pixels within each inch.
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The amount of pixels within each inch in the image represents the image pixel resolution or ppi (pixels per inch). Because raster images cannot be enlarged without losing quality, different suppliers have specific size requirements for their processes they require a specific pixel resolution: a specific amount of pixels within each inch. Raster images' dimensions are measured in pixels. Either way you are spreading the original data over a larger area at the risk of losing clarity.Ī vector program will use a mathematical formula to build an image that can be scaled to any size without losing quality.įirst let me say: Raster images are also called Bitmap images, pixels are also called dots, and dots-per-inch (dpi) sometimes called pixels-per-inch (ppi) although technically they have distinct meaning I may use those terms interchangeably in this website.
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A raster image can be enlarged by either adding more pixels (which Photoshop randomly - but smartly - adds) or enlarging the size of the pixel. When a raster image is scaled up, it usually loses quality. Vector graphics also display an outline or wireframe view and this is very important for certain processes, more details below. I've magnified the raster and vector images above and we can easily see the differences between the two but sometimes you cannot see the difference at a glance on a normal view.