Instead of trying to keep track of the millions of tiny pixels in a raster image, vector images keep track of points and the equations for the lines that connect them. This is a common problem but can be remedied by using raster image editing programs such as Photoshop to change resolution and properly scale images.Ĭommon Raster Image Types: JPG, TIFF, GIF, PNG, BMP This is because we are stretching the pixels over a larger area, thus making them look less sharp. As you may have guessed, the more pixels in the image and the higher the resolution is, the higher quality the image will be.įor example, if we scale a raster image to enlarge it, without changing resolution, it will lose quality and look blurry or pixilated. The number of pixels that make up an image as well as how many of those pixels are displayed per inch, both determine the quality of an image. Since raster images are pixel based, they are resolution dependent. Raster images are compiled using pixels, or tiny dots, containing unique color and tonal information that come together to create the image. These are the types of images that are produced when scanning or photographing an object. Boca Raton, FL: CRC Press.Raster (or bitmap) images are generally what you think about when thinking of images. A computational introduction to digital image processing (2nd ed.). In general, vector images require less memory to store necessary data compared to raster images. A vector image can be converted into a bitmap image of the required resolution, but it is rather difficult to convert the bitmap image into a vector without loss of quality. It is noteworthy that vector graphics can be easily transferred to raster format. Thus, vector images are based on geometrical formulas, while raster pictures have pattern dots. The Adobe Illustrator and CorelDraw programs are more appropriate for working with vector images. Although Adobe Photoshop allows working with vector images, it is still a raster editor. For example, various logos, business cards, and banners for websites need vector images in terms of design. Vector images are especially useful when there is a need to increase a photo or any other picture without losing its quality. In other words, a vector image includes information in the form of formulas and mathematical calculations, having a small size regardless of the actual scale of the depicted canvas (McAndrew, 2015). A vector image contains information about the positions of points as well as data about the line passing through the reference points. Vector images do not consist of dots containing color information, but reference points and vector lines connecting them. As a result, the image is distorted, and its small details become illegible. To reduce the raster pattern, one has to transform several neighboring points into one or throw away extra points. To enlarge an image, it is necessary to increase the size of the squares, and then it becomes stepped. According to McAndrew (2015), the mentioned images are also difficult to scale and even harder to edit. The computer remembers the colors of all the squares in a row in a certain order, which explains why bitmaps require more memory to store information. A raster image, unlike a vector image, is capable of transmitting a realistic image with a lot of small details. For example, any digital photo consists of these multicolored dots. Looking at the screen with thousands of dots of different colors and shades, people identify objects and images composed from them (McAndrew, 2015). The more points on the plane and the smaller they are, the more one sees the image. In bitmap images, each square called raster has its color and brightness, composing a mosaic.
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