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unit54 graphics, images, and audio

unit54 graphics, images, and audio - Graphics Images and...

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1 1 Unit 5 Graphics, Images, and Audio 2 Graphics, Images, and Audio Computer Graphics 1. Bitmap Images 2. Vector Images 3. File formats Image Contents 1. Color Depth 2. Dithering 3. Compression Audio 1. How it works 2. File Formats Digital Video 1. How it works 2. Digital video file formats 4. Transparency 5. Alpha Channel 3 Computer Graphics Computer graphics refers 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. 4 Computer 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 vector graphic, you are creating mathematical equations
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2 5 Computer Graphics A bitmapped graphic is 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 Images 6 Computer Graphics An exaggerated example of a bitmapped image: - Bitmap Images 7 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 modified Computer Graphics - Bitmap Images 8 Vector graphics are 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 shapes Computer Graphics - Vector Images
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