Remember though that some images, like photographs, are still best displayed in raster format. Overall, as compared to vector graphics, raster graphics are less economical, slower to display and print, less versatile and more unwieldy to work with. 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. In addition, you are able to freely change line/filling colors and extract/combine them to create your own illustrations for your presentation.Raster graphics are best used for non-line art images specifically digitized photographs, scanned artwork or detailed graphics. Vector images - generally refer to illustrations, drawings - with ability to enlarge without losing quality.Īll PPT diagrams we developed are vector graphics and can be scaled to any size without loss of resolution. Raster (Bitmap) images - generally refer to photographs, pictures - with great color detail, but can’t enlarge without becoming blurry. Popular Vector file format extensions include: EPS, AI, CDR, PPT/PPTX, WMF/EMF, SVG, et al. Generally Vector images are created through the process of drawing with vector illustration programs such as CorelDRAW, Adobe Illustrator, or PowerPoint. Because vector images scale up or down without the loss of image quality, they can be output at any resolution both on screen and in print. The math is simply recalculated to produce an object twice the size of the original. For example a 1″ square object would need to be multiplied by a factor of 2 in order to double in size. When an illustration (drawing) program sizes a vector image up or down, it simply multiplies the mathematical description of the object by a scaling factor. They can be scaled up or down without any loss of quality. Vector images are made of lines and curves (or paths). Popular Raster file format extensions include: JPG/JPEG, GIF, PNG, BMP, TIFF, et al. Majorities of images on the Internet are Raster images as well. Pictures taken from a camera are Raster images. Generally Raster images are created through the process of scanning source artwork or "painting" with a photo editing or paint program such as Corel PhotoPAINT or Adobe PhotoShop. Spreading the pixels over a larger area causes the image to begin to lose detail and clarity. Increasing the number of pixels or making the pixels bigger in an image results in the original data being spread over a larger area. When you attempt to increase the size of an image created in a raster based program, the pixels defining the image can be increased in either number or size. They are created using a grid of pixels to define the image. Each pixel is a tiny square with assigned color value. Every shape is composed of thousands of pixels which is why we cannot see individual squares while looking at a bitmap image. Raster (Bitmap) images are composed of pixels. There are two types of images in the digital world - Raster (also called Bitmap) and Vector. The second, let's explain the difference. The Raster (Bitmap) image becomes blurry when enlarged, however the Vector image keeps the same resolution regardless of enlarging the size. No - if images are Raster (Bitmap) graphicsįirst, take a look at the following example. Have you ever tried enlarging images and then images became blurry? Is there a way to enlarge images without losing quality?
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