![]() As a result, they can appear jagged and lose detail if they are scaled on-screen or if they are printed at a higher resolution than they were created for. This means that they represent a fixed number of pixels. Raster images are the most common electronic medium for continuous-tone images, such as photographs or images created in painting programs, because they can represent subtle gradations of shades and colour. When working with bitmap images, you edit pixels rather than objects or shapes. For example, a windmill in a bitmap image is made up of a collection of pixels in that location, with each pixel part of a mosaic that gives the appearance of a windmill. Each pixel in a bitmap image has a specific location and colour value assigned to it. ![]() The images use a grid of small squares, known as pixels, to represent graphics. Paint and image-editing software, such as Adobe Photoshop, generate bitmap images (not to be confused with the Photoshop Bitmap color mode), also called raster images. Image File Format Definitions Raster (Bitmap) Graphics ( TIFF or TIF file format, EPS file type, Photoshop PSD files) see a simplified version of Adobe's definitions below. Vector graphics are created using Bezier curves. These images are resolution-dependent, meaning that their physical size is directly associated with their resolution (the number of Dots (pixels) per Square Inch or DPI that they contain). Raster images are generally photographs or images made up of pixels. Raster (or bitmap) images and vector images. There are two image main image file format definitions used in a typical graphic design project. Image File Format Definitions for Prepress Preparation
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