Unit 202 - Lesson 5 - Compression
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This document discusses digital media compression. It aims to help readers understand compression techniques, specifically lossy versus lossless compression. Lossy compression permanently eliminates some data to greatly reduce file sizes, while lossless compression uses formulas to compress files without losing any quality upon decompression. Examples show lossy compression can shrink files more than lossless compression, though quality is reduced. The document seeks to explain these concepts and differences between uncompressed, compressed, lossy, and lossless files and compression techniques.
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Lesson 1 - Photographic Medium
This document provides an overview of a lesson on digital photography that has three main goals: to know various types of photographic medium, to research and describe current and historic concepts of photographic medium, and to understand the key differences between each. Students are asked to research and describe at least three different types of photographic medium, considering historic concepts like film speed and physical size, as well as current concepts like storage capacity and read/write speeds. The lesson introduces key topics on photographic medium, visual styles and composition, and influential photographers.
LO1 - Lesson 2 - Characters
This document provides an overview of platform video games and compares the characters of Mario and Sonic. It defines platform games as those where the player controls a character jumping or climbing over surfaces. Mario first appeared in 1981's Donkey Kong while Sonic debuted in 1991. Both became iconic characters featured in many arcade, console and handheld games. Students are tasked with playing free online versions of Mario and Sonic games to compare their key gameplay features and attributes.
LO1 - Lesson 5 - Software
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This document discusses various audio file formats including uncompressed, lossy compressed, and lossless compressed formats. It defines key audio file formats such as WAV, AIFF, MP3, AAC, Ogg Vorbis, FLAC, and ALAC. WAV and AIFF are uncompressed formats that maintain quality but use significant storage. MP3, AAC, and Ogg are popular lossy formats that reduce file size by removing imperceptible audio data. FLAC and ALAC are lossless compression formats that reduce file size without quality loss by identifying and removing redundant data patterns.
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These slides cover the fundamentals of data communication & networking. it covers Data compression which compression data for transmitted over communication channel. It is useful for engineering students & also for the candidates who want to master data communication & computer networking.
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- 2. Lesson Goals Understand the term compression Know different Be able compression techniques to describe compression of media files
- 3. Understand compression features Know lossy/lossless techniques Compression Recap Audio, images and video files can all be compressed... #lossless #lossy #compression
- 4. Understand compression features Know lossy/lossless techniques Audio Compression Audio files are generally compressed to allow devices to store a large number of files on them at the same time: WAV 30.4mb WMA 15.6mb MP3 4.2MB MP3 1.4mb 192kbps 64kbps #lossless #lossy #compression
- 5. Understand compression features Know lossy/lossless techniques Image Compression Image files are usually compressed for broadcast on the Internet, sent via email or uploaded to a website at a smaller file size: JPEG GIF #lossless #lossy #compression
- 6. Understand compression features Know lossy/lossless techniques Video Compression Videos are compressed to ease uploading to a website where they can be streamed or to be small enough to fit on DVD: OGG MP4 #lossless #lossy #compression
- 7. Understand compression features Know lossy/lossless techniques Uncompressed Files An uncompressed digital media file is one that is at the best quality it can ever be as it is an original file. These files are generally unedited and typically have a very big file size as the hold all of the original data. Uncompressed files are mainly used for storing media at it’s best quality before files are edited, compressed and broadcast elsewhere. Examples: WAV, TIFF, AVI #lossless #lossy #compression
- 8. Understand compression features Know lossy/lossless techniques Compressed Files An uncompressed digital media file is one that has been made smaller using a compression technique. These files are much smaller than uncompressed files and typically poorer quality too. Compressed files are ones that may be used to store media on a portable devices or to upload media to a website. Examples: MP3, JPG, WMV #lossless #lossy #compression
- 9. Understand compression features Know lossy/lossless techniques Lossless Compression Lossless compression is the type of compression where a formula is used calculating how to display the file. No data is lost in this type of compression, it can be recovered again by uncompressing the file using the formula. Lossless compression normally produces better quality files but they will be bigger file sizes than those using lossy compression. #lossless #lossy #compression
- 10. Understand compression features Know lossy/lossless techniques Lossy Compression Lossy compression is the type of compression that results in you losing some level of quality in the media file. This type of compression gets rid of any data deemed unnecessary by combining similar colours. This data is permanently lost, the file will never be as good as the original again. Files that are compressed using this technique are much smaller in file size. #lossless #lossy #compression
- 11. Understand compression features Know lossy/lossless techniques #lossless #lossy #compression
- 12. Understand compression features Know lossy/lossless techniques Lossless Lossy 60.1kb 1.1kb #lossless #lossy #compression
- 13. Understand compression features Know lossy/lossless techniques Your Task – Compression Define the following terms and explain the difference between both relating to media files: Explain the difference between lossy and lossless compression techniques on media files: Uncompressed Compressed Lossless Lossy Provide some examples to help illustrate your research. #lossless #lossy #compression
- 14. Understand compression features Know lossy/lossless techniques Keywords Uncompressed The original file which is at maximum quality Compressed A file made smaller for broadcasting on different platforms Lossy/Lossless Two different compression techniques