Data Portability Flashcards
Lossless compression is?
Enables the original file to be fully restored to its original state
Lossy is?
Original file cannot be reinstated
Why is compression needed
Volume - of storage required on storage devices, enables larger amounts of data to fit into the same storage space.
Bandwidth- most local or global networks would not cope with the volumes of data being sent, disrupting communication services
JPEG
Joint Photographic Experts Group
Reducing repetition of pixel patterns
GIF
Graphics Interchange Format
Loseless
PNG
Portable Networks Graphics
Lossless
TIFF
Tagged Image File Format - lossy and lossless
PICT
Apple developed graphic file superseded by pdf - pure institute of computer technology
TxT
Plain text can be stored
CSV
Comma separated values - data values
RTF
Rich Text Format - translate some of a word processors own markup into standardised rtf markup.
Portable Document Format - holds text,formatting images and portable editable regions which reader can fill in.
WAV
Windows waveform - loseless
Mp3
MPEG audio layer 3 - discards sounds human ear cannot generally hear
WMA
Windows Media Audio - made by Microsoft to complete with mp3
MIDI
Musical Instrument Digital Interface - via serial interface connected to an electronic instrument or other sound system.
MPEG
Moving/Motion picture experts group - a widely-used video file format - delta compression, involves transmitting only info about pixels that change between selected frames
MP4
MPEG 4- Stores and plays digital audio with video
AVI
Audio video interleaved - no compression applied - supports multiple audio and multiple video streams playing back from 1 file.
Data portability is ?
Portable data is data that can be directly transferred between hardware devices or programs without having to be entered again.
Data needs to be stored using different formats to ensure data is portable.
