Just as raster files are significantly larger than comparable vector files, high resolution raster files are significantly larger than low resolution raster files. Thus, high resolution images should only be used if your equipment has the capability to display them at high resolution.īetter resolution, however, comes at a price. Remember also that the resolution you actually observe on any output device is not a function of the file’s own internal specifications, but the output capacity of the device itself. The higher the dpi, the better the resolution. Resolution in raster graphics is measured in dpi, or dots per inch. To maximize the quality of a raster image, you must keep in mind that the raster format is resolution-specific - meaning that raster images are defined and displayed at one specific resolution. Although raster images can be scaled down more easily, smaller versions often appear less crisp or “softer” than the original. Hence, your raster-based logo, magnified to 1000, becomes bitmapped before you know it. Why? Ultimately, when you look close enough, you can begin to see the individual pixels that comprise the image. Just like photographic images that get blurry and imprecise when blown up, a raster image gets jagged and rough. However, because raster images are pixel-based, they suffer a malady called image degradation. Non-line art images are best represented in raster form because these typically include subtle chromatic gradations, undefined lines and shapes, and complex composition. See the basic examples below.Raster graphics are best used for non-line art images specifically digitized photographs, scanned artwork or detailed graphics. However, vectors should be used at radical scale or for clarity of defined edges in simple shapes, such as logos and illustrations. If something requires more detail at an adequate scale, raster images are optimum. ![]() Raster images should be used for photos while vectors should be used for logos and illustrations. Because the scaling versatility, vectors are excellent for logos, illustrations, sign writing and embroidery. SVG, EPS, PDF and AI are common file formats for vector graphics. Often containing less detail than a raster image, a vector will retain appearance regardless of size and can be scaled infinitely.Īlthough you can include gradients and shadows in a vector, a true vector graphic is comprised of line art that is filled with colour. Vector images are made up of points, lines, and curves that are based upon mathematical equations, rather than pixels. For digital deliverables a 72dpi is sufficient whereas print requires a minimum of 300dpi. T hey cannot be scaled without sacrificing quality. ![]() The greater the dpi and dimensions, the higher the quality, and often the file size. Quality of a raster image is often dictated by the dpi (dots per inch) and the overall dimensions of the image. ![]() JPG, GIF and PNG are all examples of different types of raster files. This means raster images are capable of rendering complex, multi-coloured visuals, such as photographs. But, what do they actually mean and how are they different? Raster imagesĪ raster image (also known as bitmap) is made up of individual pixels and each of those pixels contributes to the overall image. So, raster vs vector? You may have heard of them and just nod politely when they are mentioned.
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