Data Portability 📁

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

PDF

Portable Document Format

MP3

MPEG-1 Audio Layer-3

MIDI

Musical Instrument Digital Interface

WAV

Windows Audio Waveform

WMA

Windows Media Audio

Data compression

reducing file sizes but maintains quality using compression algorithms

Why do we use compression?

• Improve website loading times, using less bandwidth

• Faster upload and download speeds

• Save storage space so more can be stored

Lossy compression

Removes some data with small reduction in quality but can’t be restored e.g JPEG

Lossless compression

Maintains quality as no data is lost and can be restored e.g WinZip

Data Portability

ability to transfer data across computers without having to re-enter it

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

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

• 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

PDF

• 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