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Raster Graphics Raster graphics are digital images created or captured (for example, by scanning in a photo) as a set of samples of a given space. A raster is a grid of x and y coordinates on a display space. (And for three-dimensional images, a z coordinate.) A raster image file identifies which of these coordinates to illuminate in monochrome or color values. The raster file is sometimes referred to as a bitmap because it contains information that is directly mapped to the display grid. A raster file is usually larger than a vector graphics image file. A raster file is usually difficult to modify without loss of information, although there are software tools that can convert a raster file into a vector file for refinement and changes. Examples of raster image file types are: BMP, GIF, and JPEG files. Image editors that use raster (pixel/bitmap-based) graphics are also known as paint applications. This is the most popular type of graphics software. Image editors allow you to create bitmap-based images from scratch with a variety of painting tools intended to mimic natural painting tools. Almost all image editing software includes features for photo enhancement and retouching as well. The advantage to bitmapped images are that you can get a great deal of detail, as much detail as a photograph. The downside is that you will always be confined by the pixel resolution of the image. Image editors are used to edit digital photos and scanned images and for creating continous-tone and photo-realistic artwork. These are some well-known image editing programs:
Now let's learn how to create a simple raster animation with Adobe© PhotoShop and ImageReady |
