- Created by: smonteith336
- Created on: 06-02-18 09:55
JPEG - Joint Photographics Group
- JPEG is a compressed Bitmap.
- File size is low due to reuced pixel patterns or repitition of pixel patterns.
- Origionally designed for photographs.
- JPEG does not support animation or transparency.
- Copmression used is lossy.
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GIF - Graphics Interchange Format
- GIF is a cmpressed bitmap image file type.
- GIF files can be singular still images or animated sequences of images.
- It can contain transparent pixels.
- Lossless compression is used.
- File size is kept low by restricting colour depth.
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PNG - Portable Network Graphics
- PNG is pronounced "ping".
- It is a compressed, bitmapped image file type.
- It was initially developed for online image sharing.
- PNG files do not use CMYK colour mode which is made for printing.
- Uses lossless compression techniques.
- Supports transparent pixels.
- Does not support animation.
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TIFF - Tagged Image File Format
- Developed to be usable in Microsoft Windows and Apple Macintosh operating systems.
- Used as a standard file type in commercial printing.
- OCR software commonly produces TIFF files from scans.
- TIFF files can be used for holding images of other file types.
- They have a very complex structure compared to other image file types.
- Uses both lossy and lossless compression.
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- Apple developed PICT as their native graphic file type for the interchange of graphics between various Apple programs.
- Since the release of Mac OS X the format has been superseded by PDF.
- It is an object-oriented file type.
- It can store vector and bitmap graphics.
- it can use up to 24-bit colour, yeilding 224 or 16,777,216 colours which is known as true colour.
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TXT - Text
- TXT is pronounce "text".
- Plain text files can be stored as .TXT files.
- A TXT file will store charactor strings that can be readily veiwed and edited.
- No additional formatting information will be associated with the text.
- The entire contents will be presented textually
- it will not be interpreted as formatting information.
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CSV - Comma Separated Values
- CSV files are plain text files.
- They can be created, viewed and edited using plain text editor.
- They can also be opened within spreadshhet and database packages.
- When data is structured in a tabular manner it will have a common structure on each row.
- When stored in a spreadsheet or database, it has clearly visable columns.
- A comma charactor is used to separate the data values into respective columns.
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RTF - Rich Text Format
- RTF format is used for text based documents and supports basic formatting.
- It allows text files to be moved between different word processors and operating systems.
- Documents scanned by an OCR facility of a scvanner are usually saved as RTF files.
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PDF - Portable Document Format
- A PDF file holds text, formatting and images.
- It can also potentially hold some editable regions which can be filled in by the user.
- This file type can be viewed using many applications across a wide range of operating systems andhardware platforms.
- Graphics, spreadsheets, webpages and several other files can be exported to PDF file.
- It has powerful compression techniques which keeps file size low.
- It has password protection, to reduce both access and likelyhood of breaches of copyright.
- Metadata is used to improve the speed of text ssearches and for labelling document etc.
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WAV - Windows Waveform
- WAV is pronounced "wave".
- This file format is lossless and provides a close likeness to the origional anologue sound.
- Lots of programs are available to help manipulate WAV files.
- WAV files have a simple digital representation.
- WAV files are generally too large to be practical for online distrubution.
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MP3 - MPEG Audio Layer 3
- MP3 uses lossy compression techniques.
- WAV files can be stored in MP3 format, this enables more sound data to fit into storage dedvises without a noticable sound quality deterioration.
- The music indistry tends not to use MP3 because of this deterioration.
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WMA - Windows Media Audio
- This was developed by Microsoft to compete with MP3 for popularity.
- LIke MP3, uses lossy compression.
- Amont of compression can be vareid.
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MIDI - Musical Instrument Digital Interface
- Captured using a serial interface connected to an electric musical instrument or other sound system.
- the connctions linking them are called MIDI channels and data can be sent and recieved from serial interface by MIDI channels.
- Thanks to MIDI standard, all MIDI technology is interoperable.
- MIDI is not a storage format, it is a transmittion.
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MPEG - Moving/Motion Picture Experts Group
- MPEG is a widely used video file format.
- it uses delta cmpression, which involves transmitting only the information about pixels that change between frames of a video.
- this reduces the overall data transmitted.
- To sustain the overall video quality, a whole frame will also be transmitted but at less frequent intervals.
- MPEG can be used on optical disks for various video resolutions.
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MP4 - MPEG-4 Part 14
- The MP4 formmamt was designed for digital streming over the internet.
- It stores and plays digital audio with video.
- Since it's part of MPEG standards MP3 can be played on MP4 players.
- It supports subtitling nad online streaming and the file can still include images.
- Lossy compression is used to reduce the file size.
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AVI - Audio Video Interleave
- AVI supports multiple audio and vidio streams playing back from 1 file.
- No further compression is applied to existing clips saved as AVI format.
- This sutains the origional quality but leads to higher file sizes until optional compression is applied.
- AVI files do not store the ratio of width to height for playback.
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