chap10 - Computer Science Department (CSD) Centre for...

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FOSEE , MULTIMEDIA UNIVERSITY (436821-T) MELAKA CAMPUS, JALAN AYER KEROH LAMA, 75450 MELAKA, MALAYSIA. Tel 606 252 3594 Fax 606 231 8799 URL: http://fosee.mmu.edu.my/~csd/ Computer Science Department (CSD) Centre for Foundation Studies and Extension Education (FOSEE) PCA 0015 Computer Applications Foundation in Engineering ONLINE NOTES Chapter 10 Multimedia
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PCA0015 Computer Applications Chapter 10 Objectives: Upon completion of this topic, the students should be able to: Define multimedia and its elements. Understand bitmap and vector images and their characteristics. Identify audio and video format and its characteristics. Understand the areas of multimedia applications. Graphics falls into two main categories: 1. Bitmap Graphics 2. Vector Graphics The difference between these two types is what they're made up of. Bitmap graphics are made up of little squares called pixels. Vector graphics are made up of lines and curves. 10.1 Bitmap Graphics By far, most of the images you have seen on the Web are bitmaps. GIF and JPEG, the most commonly used graphics file formats on the Web, are both bitmapped formats. Bitmap images are formed from matrix of pixels with different colors and are defined by their dimensions in pixels as well as by the number of colors they represent. Note: Don't confuse the Windows file format BMP with the graphic category bitmap . Although BMPs are bitmaps, the term bitmap is more inclusive and describes the entire class of graphics that store image information as pixels in a grid. Bitmap images are widely used but they have the disadvantages. One of them is that they must be printed or displayed at a size determined by the number of pixels in the images. When enlarged the picture appears blocky. This is because CSD Lecturer 2/11
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PCA0015 Computer Applications Chapter 10 when you enlarge the picture, the software has to guess where to put the new pixels. When you reduce the picture, the software has to decide which pixels to throw out Bitmap images have large file sizes that are determined by the image's dimensions in pixels and color depth, so to reduce this problem, some graphic formats store the images in compressed format: PCX : the first standard for bitmapped, extinct! GIF (Graphic Interchange Format) JPEG (Joint Picture Experts Group) TIFF (Tagged Image File Format) : Provides the highest quality but has large file sizes. Suitable for printing BMP : uncompressed format for Microsoft Windows and IBM OS/2. It has a maximum of 16.7 million colors PNG (Portable Network Graphics) Popular bitmap editing programs are: Microsoft Paint Adobe Photoshop Corel Photo-Paint Jasc Paint Shop Pro Ulead PhotoImpact 10.2 Vector graphics Vector-based images are composed of key points and paths, which define shapes, and coloring instructions, such as line and fill colors. The computer follows these descriptions to display the image. Vector-based images are edited by moving the
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This note was uploaded on 06/16/2011 for the course ENGR 101 taught by Professor Ahmed during the Summer '11 term at Multimedia University, Cyberjaya.

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chap10 - Computer Science Department (CSD) Centre for...

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