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Unit 202 - Lesson 5 - Compression

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Unit 202

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Unit 202 - Lesson 5 - Compression

  1. 1. Digital Media Lesson 5
  2. 2. Lesson Goals  Understand the term compression  Know different  Be able compression techniques to describe compression of media files
  3. 3. Understand compression features Know lossy/lossless techniques Compression Recap Audio, images and video files can all be compressed... #lossless #lossy #compression
  4. 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. 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. 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. 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. 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. 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. 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. 11. Understand compression features Know lossy/lossless techniques #lossless #lossy #compression
  12. 12. Understand compression features Know lossy/lossless techniques Lossless Lossy 60.1kb 1.1kb #lossless #lossy #compression
  13. 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. 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

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