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Digital Multimedia

Digital Multimedia. Text Files. File Formats and Respective Software TXT – Text Document - Notepad, TextEdit DOC – Document - Microsoft Word DOCX – Document XML – Microsoft Word 2007, 2010 PDF – Portable Document Format - Adobe Acrobat RTF – Rich Text Format – WordPad, TextEdit

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Digital Multimedia

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  1. Digital Multimedia

  2. Text Files • File Formats and Respective Software • TXT – Text Document - Notepad, TextEdit • DOC – Document - Microsoft Word • DOCX – Document XML – Microsoft Word 2007, 2010 • PDF – Portable Document Format - Adobe Acrobat • RTF – Rich Text Format – WordPad, TextEdit • ODF – Open Document Format – OpenOffice, LibreOffice

  3. Bits and Bytes • Digital  everything is ONES (1) and ZEROS (0) • Only 2 different numbers  Binary • Base 2 number system • binary digit  bit (b) • How many bits are there? 01011001 • 8 bits = 1 Byte (B)

  4. Big Bytes Kilobyte (KB) = 103 = 1000 bytes Megabyte (MB) = 106 = 1000000 bytes Gigabyte (GB) = 109 bytes Terabyte (TB) = 1012 bytes Petabyte (PB) = 1015 bytes Exabyte (EB) = 1018bytes Zettabyte (ZB) = 1021bytes Yottabyte (YB) = 1024 bytes Kibibyte(KiB) = 210 = 1024 bytes Mebibyte (MiB) = 220 = 1048576 bytes Gibibyte (GiB) = 230 bytes … Why? Read more.

  5. Data Compression • Compress / shrink size of files • How file compression work? Read more… • Compression can sometimes affect the quality • But is it something that you will notice? • Examples: • mp3 vs. wav (3 MB vs. 30 MB) • jpg vs. bmp (100 KB vs. 1 MB) • Why would we ever want to compress data? Give specific scenarios.

  6. Lossy vs. Loss-less compression • Lossy compression • original quality CANNOT be reconstructed when decompressed (mp3, jpg) • JPEG Example • How do mp3s work? Read more… • Loss-less compression • original quality CAN be reconstructed when decompressed (zip)

  7. Graphics & Images • File Formats? • GIF • JPEG, JPG - compressed • BMP • PSD • PNG • TIFF • Image Software? • Adobe Photoshop • Microsoft Paint • GIMP • Paint.Net

  8. Graphics Terms • pixel ~ picture element • resolution ~ number of total pixels (could be dimensions too) • DPI ~ dots per inch (pixel density) • pixel depth ~ color depth ~ bit depth • Number of bits used in a single pixel • More bits  more colors • What is the tradeoff for a high quality pixel depth?

  9. Why do pixels matter? • Digital Cameras • Is getting a higher mega-pixel camera worth it? • High Definition images • Quality vs. Quantity • Mr. Bui’s Picture Example • What is its resolution? • How many bytes is it? • Resizing • Changing quality

  10. Audio • File Formats? • mid • mp3 • m4a • wav • ogg • flac • wma Audio Software? • Audacity • GarageBand • FLStudio

  11. Video • File Formats? • avi • wmv – Windows Media Video? • mp4 • divx • mpeg • Video Software? • Adobe Premiere • Windows Movie Maker • Apple iMovie • Apple Final Cut Pro • Sony Vegas

  12. Lab Assignment • Create the following: • GIF, JPG, and BMP images of yourself • MP3, M4A, and WAV sounds of your voice • Create a video of yourself presenting the differences between your GIF, JPG, and BMP images. Also present the differences between MP3, M4A, and WAV. This will be the most time-consuming portion of the assignment because you will need to create a movie using iMovie that has transitions and sound. • Be sure your video has title screen(s) and still shots of the pictures. • If possible, try to illustrate the loss of quality by recording something as MP3. (this may be difficult, but try it out)

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