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A vector graphic is a type of a computer graphics that uses mathematical relationships between points on an image to describe that image. Vector graphics are more flexible and clear than raster, or bitmap, graphics, which are computer images that are made up of individual colored dots called pixels. There are a limited number of pixels in raster images, which means that a larger image needs more pixels and a smaller image fewer pixels. A vector graphic does not have that limitation because can be reduced or enlarged easily, based on the mathematical relationships between points “A” and “B." The mathematical relationship between the points is depicted as a path, or the line or curve that connects the two points.
Clarity, no matter the size, is one of the advantages of a vector graphic. Since a raster image, also known as a bitmap image, uses a limited amount of pixels to make up a picture, it cannot usually be enlarged without a loss of clarity. For example, if an image with 100 pixels needs to be enlarged to one with 1,000 pixels, the computer will have to add information in order to fill up the 900 extra pixels, often resulting in loss of clarity. Vector graphics do not have this limitation. Since a vector graphic uses math to express the relationship between two points in paths, enlarging and reducing the picture will not usually result in a loss of clarity.
This clarity often makes a vector graphic ideal for use in typeface, line art, and illustrations. As a business logo, for example, a vector graphic’s size can be decreased to be printed on letterheads and envelops, and can be enlarged for billboards with no loss of quality. Vector graphics are usually small files because the math describing the image is the only thing that needs to be stored. In addition, different people can edit the picture using the appropriate software by simply moving the dots around, which changes the path between the dots. These advantages allow it to be used in applications such as business logos, page layouts, fonts, and text art, among other uses.
Unfortunately, vector graphics are not usually ideal for photographic pictures. These details are often reserved for raster images. A vector graphic can be rasterized, however, which means it can be converted to a raster image by assigning pixels to the image, rather than using mathematical relationahips to describe it. A raster image can also be converted into a vector image, but it usually takes more work to make a clean vector graphic. Once rasterized, a vector image — now a raster image — can be edited as a regular raster image.