2 Text Files File Formats and Respective Software TXT – Text Document - Notepad, TextEditDOC – Document - Microsoft WordDOCX – Document XML – Microsoft Word 2007, 2010PDF – Portable Document Format - Adobe AcrobatRTF – Rich Text Format – WordPad, TextEditODF – Open Document Format – OpenOffice, LibreOffice
3 Bits and Bytes Digital everything is ONES (1) and ZEROS (0) Only 2 different numbers BinaryBase 2 number systembinary digit bit (b)How many bits are there?8 bits = 1 Byte (B)
5 Data Compression Compress / shrink size of files How file compression work? Read more…Compression can sometimes affect the qualityBut 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 compressionoriginal quality CANNOT be reconstructed when decompressed (mp3, jpg)JPEG ExampleHow do mp3s work? Read more…Loss-less compressionoriginal quality CAN be reconstructed when decompressed (zip)
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 depthNumber of bits used in a single pixelMore bits more colorsWhat is the tradeoff for a high quality pixel depth?
9 Why do pixels matter? Digital Cameras High Definition images Is getting a higher mega-pixel camera worth it?High Definition imagesQuality vs. QuantityMr. Bui’s Picture ExampleWhat is its resolution?How many bytes is it?ResizingChanging quality
11 Video File Formats? Video Software? avi wmv – Windows Media Video? mp4 divxmpegVideo Software?Adobe PremiereWindows Movie MakerApple iMovieApple Final Cut ProSony Vegas
12 Lab Assignment Create the following: GIF, JPG, and BMP images of yourselfMP3, M4A, and WAV sounds of your voiceCreate 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)