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JPEG
Joint Photographic Experts Group
TIFF
Tagged Image File Format
PNG
Portable Network Graphics
PICT
Apple Graphics
GIFF
Graphics Interchange Format
MP4
MPEG-4 Part 14
MPEG
Moving/ Motion Pictures Experts Group
AVI
Audio Video Interleaved
TXT
Plain text
CSV
Comma Separated Value
RTF
Rich Text Format
Portable Document Format
MP3
MPEG-1 Audio Layer-3
MIDI
Musical Instrument Digital Interface
WAV
Windows Audio Waveform
WMA
Windows Media Audio
What is data compression?
Used to reduce file size but maintain quality
Why do we use compression?
Improve website loading times
Faster upload and download speeds
Save storage space
Lossy compression
Reduces file size by removing some data with small reduction in quality e.g JPEG
Lossless compression
Maintains quality as no data is lost e.g WinZip
MP4
Very portable and is played by nearly all video software
Designed for online streaming
Lossy compression but can maintain very high image quality
Can contain subtitles
The default format used by mobile phones and digital cameras
MPEG
Very portable and is played by nearly all video software
Designed for online streaming
Lossy compression but can maintain very high image quality
Can contain subtitles
The default format used by mobile phones and digital cameras
AVI
Fairly portable and can be played by most video software
Does not compress video and therefore keeps full quality
Can contain multiple streams such as multiple camera angles
Very high file sizes
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JPEG
Very portable - opened by all graphic & desktop design packages
Used on webpages/ most phones
Suitable for real images
Lossy compression but keeps most detail
Quality can be set as percentage
TIFF
Not very portable - often needs special software
Lossy and lossless compression or save without compression
Larger file size than PNG/JPEG
Professional photographers
Can have a transparent background
PNG
Very portable - opened by all graphic & desktop design packages
Lossless compression
Very high quality image
Online use, not CMYK colour
Can contain layers and have transparent backgrounds
PICT
Very limited portability
Design by Apple Macintosh
Can be Compressed
Not widely used
Can store bitmap and vector images
GIFF
Portable - opened in most graphic packages
Lossy and lossless compression
Very small file sizes as colour quality is very limited
Often used for icons/ buttons
Can have a transparent background
TXT
Very portable & be opened by most processing software
Plain text- no images/ formatting
Pronounced text
Very small files sizes
CSV
Portable between word and spreadsheet applications
Plain text- no images/ formatting
Small file sizes
Tabular structure- each row separated by various means
RTF
Very portable between word processing
Text and styling is stored so all word processing displays it the same
Smaller size compared to other fromats
Not all advanced formatting can be saved
Very portable & viewed by a wide range of software
Contain editable regions- often used for online forms and job applications
Most web browser display PDFs from within the software
Can be highly compressed
MP3
Very portable can be played by any audio software and used to share audio online
Lossy compression
Quality can be so close to original that human ears can’t hear the difference
Most portable audio devices use MP3
MIDI
Can only be played through software that interprets MIDI formats
Digital signals are recorded
Can be played back as a range of sampled sound
Does not actually sample sounds- cannot be used to record real audio
WAV
Very portable can be played by any audio software
Lossless compression
Used by audio professionals and CDs to record sounds
Large files sizes - rarely used online/portable devices
WMA
Fairly portable - play on most audio devices but not all
Developed by Microsoft to compete with MP3
Not very popular
Lossy compression and can can be varied
