1 / 14

Multimedia Elements II

Multimedia Elements II Graphics, Digital Video Multimedia Elements Multimedia elements include: Digital Video Digital Audio Text abvdefghij Klmnopqrst uvwxyz Multimedia Graphics Animation Multimedia Elements Graphics

johana
Download Presentation

Multimedia Elements II

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Multimedia Elements II Graphics, Digital Video

  2. Multimedia Elements • Multimedia elements include: Digital Video Digital Audio Text abvdefghij Klmnopqrst uvwxyz Multimedia Graphics Animation UIT - Multimedia Production

  3. Multimedia ElementsGraphics • Graphics is a digital representation of non-text information such as a drawing, chart, or photograph. • It is also called a digital picture or image, and contains no movement or animation • 3 fundamental characteristics of color • Hue (色調) • Related to the wavelength of light • Lightness (亮度) • Related to the amplitude of light • Saturation (彩度) • Related to the purity of light UIT - Multimedia Production

  4. Multimedia ElementsGraphics Pixel • A pixel is the smallest unit of programmable color on a computer display or in a computer image • Every computer graphic is made up of a grid of pixels • There are two types of graphics • Bitmap graphics • Vector graphics UIT - Multimedia Production

  5. Multimedia ElementsGraphics Bitmap Graphics • Bitmap is a representation of a graphics image • Consists of rows and columns of dots • The value of each dot (whether it is filled in or not) is stored in one or more bits of data • Simple monochrome images use one bit to represent each dot UIT - Multimedia Production

  6. Multimedia ElementsGraphics Bitmap Graphics • The more bits used to represent a dot, the more colors and shades of gray that can be represented: 1-bit image, 2 color: black or white 8-bit image, 256 colors (28=256) 24-bit image, 16777216 colors (true color) UIT - Multimedia Production

  7. Multimedia ElementsGraphics Vector Graphics • Vector graphics are based on mathematical formulas that represent curves and lines • Very smooth looking and can easily be resized without loss of image quality BitmapVector 00000000000000 {(3, 2)  (10, 2)} 00111111111100 00000000000000 00000000000000 UIT - Multimedia Production

  8. Multimedia ElementsGraphics Vector Graphics • An example of vector graphic is the clipart in MS PowerPoint • When you enlarge a clipart image, it will not distort UIT - Multimedia Production

  9. Multimedia ElementsGraphics Resolution • Determines how sharply the image is represented • Expressed in dot per inch (dpi), or simply by the number of rows and columns, such as 640 by 480 • Bitmap graphics suffer distortion in image quality when being scaled up, this does not happen in case of vector graphics Vector graphic Bitmap graphic UIT - Multimedia Production

  10. Multimedia ElementsGraphics Formats • A format is a standard specifying how the data is arranged • For bitmap graphics • BMP • GIF • JPEG • For vector graphics • AI • FH • WMF UIT - Multimedia Production

  11. Multimedia ElementsGraphics Formats • BMP (.bmp) • Microsoft's native graphic file format • GIF (Graphic Image Format) (.gif) • Only supports 256 colors; It serves as compressed web graphics. GIF works best when the number of colors within an image is small • JPEG (Joint Photographic Experts Group) (.jpg) • Supports millions and allows for graphic compression. Most people use JPEG for Web graphics that contain a multitude of colors and gradations - like photographic images • AI (Adobe Illustrator) (.ai) • For graphics produced by Adobe Illustrator • FH (FreeHand) (.fh) • For graphics produced by FreeHand • WMF (Windows Metafile Format) (.wmf) • For exchanging graphics between Microsoft applications such as clipart in Microsoft Office UIT - Multimedia Production

  12. Multimedia ElementsGraphics GIF versus JPEG • When the number of color of an image is large, JPEG performs better JPEG format, 6k bytes GIF format, 13.5k bytes UIT - Multimedia Production

  13. Multimedia ElementsGraphics GIF versus JPEG • When the number of color of an image is small, GIF performs better JPEG, 5.4 bytes GIF, 1.5k bytes UIT - Multimedia Production

  14. Multimedia ElementsComputer-based Animation Animated GIFs • Animated GIFs are a special kind of GIF file known as GIF89a • An animated GIF file stores multiple images as separate blocks within a single GIF file • When being viewed on the Web, the multiple images are streamed (played back one at a time) • Streaming: the viewer does not have to wait for the entire GIF to be downloaded before it begins running on a Web page UIT - Multimedia Production

More Related