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Representing Data - Data Portability (File Formats (JPEG - Joint…
Representing Data - Data Portability
What Is Data Portability?
The ability to move, copy or transfer data between software packages, operating systems
A file is highly portable if....
Can be opened with lots of different types of programs
Data can be displayed the same across different programs
File can be opened on different operating systems
File Formats
JPEG - Joint Photographic Experts Group - Lossy Compression
TIFF - Tagged Image File Format - Compressed and Highly portable
PNG - Portable Networks Graphics - Can contain transparent backgrounds
PICT - From the Apple Macintosh - Picture
GIF - Graphic Interchange Format - Supports Bitmap Images
TXT - Text / Plain text file - Only holds letters and numbers
CSV - Comma Separated Variables - Text file with each piece of information being separated by a comma
RTF - Rich Text Format - Easily read by most word processing programs
PDF - Portable Document Format - Very Portable Format
MP3 - Moving Picture Experts Group - Compress audio file
MIDI - Music Instrument Digital Interface - Music files produced when instruments are connected as input devices
WAV - Windows Audio Waveform - Staderd for holding audio bit stream on PC
WMA - Windows Media Audio - Compressed file format
MP4 - Moving Picture Experts Group 4 - Stores compressed video and audio
MPEG - Moving Picture Experts Group - Compressed video format
AVI - Audio Video Interleave - Highly portable
Data Compression
Lossy Compression
Removes some file data such as reducing the number of colours used in an image
Small reduction in image quality
JPEG is an example of Lossy compression
Lossless Compression
Maintains the quality of the file
No data loss
Winzip is an example
Reduces file size for sending over internet. Decompressed on far side without any loss of quality