11Unit 5Graphics, Images, and Audio2Graphics, Images, and Audio•Computer Graphics1.Bitmap Images2.Vector Images3.File formats•Image Contents 1.Color Depth2. Dithering3. Compression•Audio1.How it works2.File Formats•Digital Video1.How it works2.Digital video file formats4. Transparency5. Alpha Channel3Computer Graphics•Computer graphicsrefers to using a computer to create or manipulate any kind of picture, image, or diagram•Typically you manipulate an image on your computer with a graphics editing program–MS Paint–Adobe Photoshop–GIMP 2–Etc.4Computer Graphics•There are two basic types of graphics:–Bitmapped (rasterized)–Vector•When you create a bitmapped (rasterized)graphic you are basically creating a bunch of colored dots•When you create a vectorgraphic, you are creating mathematical equations
has intentionally blurred sections.
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25Computer Graphics•A bitmapped graphicis stored as an array of dots, or pixels–Each pixel gets assigned a specific color•The more pixels you have, the more detailed the image can be•Some common bitmap graphics programs are:–Photoshop–Paint Shop Pro–GIMP–Photo-Paint–Graphic Converter•These are paint programs- Bitmap Images6Computer GraphicsAn exaggerated example of a bitmapped image:- Bitmap Images7•Created by scanners, digital cameras, and other similar devices•Most commonly used format on the web•Advantage:–Very flexible: with enough pixels, anything picture can be represented•Disadvantage:–Takes a lot of memory: the color of each pixel must be represented–Not easily modifiedComputer Graphics- Bitmap Images8•Vector graphicsare made up of mathematical equations representing lines and shapes in the image•Vector graphics are created and manipulated using drawing programs –as opposed to paint programs for bitmapped graphics•Instead of using pixels to describe the image, it describes the image using shapes–Circles–Lines–Curves•Also has to store the color of these shapesComputer Graphics- Vector Images