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| Question | Answer |
| Describe what is meant by compression. | Reducing the storage space of files on the hard disk. |
| Name the two types of compression. | Lossy and Lossless |
| Why do we specifically compress image files? | When images are on webpages; if they are not compressed, the webpage will take ages to load the content which encourage users to click off the webpage. |
| Alexis wants to send a TIFF file of an avocado to her friend Ethan via 4g. He suggests that she compresses the file. Explain why he would say this. | So that Alexis' mobile phone network will impose smaller charges as she will send a smaller file. |
| Bryony wants to stream a YouTube video of Earthbound. Explain why the video file would need to be compressed. | Even on fast connections, video files (which are generally large in size) have to be compressed to reduce buffering. All of the data has to be processed before the viewer can watch it. |
| Give a brief summary of the differences between lossy and lossless compression. | Lossy compression actually removes some unnecessary data which results in a much smaller file. Lossless compression allows the file to be restored but the file size is larger. |
| Lossy or Lossless? Allows the original file to be restored. | Lossless compression allows the original file to be restored. |
| Lossy or Lossless? Compresses to a much smaller file size than the other. | Lossy compression, results in a much smaller file size compared to lossless compression. |
| Lossy or Lossless? Compresses the file to the point that the original file cannot be restored. | Lossy compression compresses the file to the point that the original file cannot be restored. |
| Fill in the blanks: When compressing a file, the more it is compressed, the _____ the quality of the file. | When compressing a file, the more it is compressed, the LOWER the quality of the file. |
| How would the following file be compressed? | Blocks of similar colours are grouped together into one single block of colour. |
| How would an audio file be compressed? | Sections of audio at frequencies higher than the human hearing range are deleted. Also, quieter sounds that are obscured by louder sounds are also removed. |
| Describe what is meant by lossless compression and explain how it works. | Lossless compression, reduces the size of a file, while still allowing it to be restored to the original. The file comes with instructions so that the computer can reverse the process. of compression |
| Lossy or Lossless? Would be used to compress a text file. | Lossless compression would be used to compress a text file. |
| Lossy or Lossless? Would be used to compress an audio file. | Lossy compression would be used to compress an audio file. |
| Sebastian has written an algorithm for a cash register. He wishes to send it to a client over email but must compress the file. Which type of compression should he use, explain your answer. | He should use lossless compression. If he used lossy compression, the algorithm would be ruined as certain characters would be deleted upon compression. |
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