1. Compression means to ______________ the size of a data file, whilst retaining most, or all, of the original information.
2. Commonly used file types that can be compressed include documents, music files, video and image files.
3. Data streaming services may compress their files to ensure _____________________
4. What are main reasons for compressing files?
5. This may sound strange, but compression depends on ____________being present in the information .
6. A pattern implies that certain parts of the data are identical but are just located at different places in the file
7. Consider a text file like this. What statement is true?
8. A text compression algorithm could do the following with this text file:
9. The efficiency of compression is a simple formula:
10. Compression is also used by video and music streaming companies to _____________________
11. The two types of compression are:
12. Disregarding some of the original information if file size is an issue is usually referred to as ____________________
13. An example of lossy compression is when a music file…
14. What statement is true about this lossy compression of images?
15. What is the benefit of compressing an image file for a use on a website?
16. A film could take up to an hour to download in uncompressed format whilst a compressed file could take just 12 minutes
17. Lossless compression is when you are:
18. Lossless compression is _________ effective than reducing file sizes than lossy compression but the trade off is no loss of quality.
19. Lossless data compression is used in many applications. For example, it is used in the ZIP file format and in the GNU tool gzip
20. Fill in the blanks for the following excerpt on lossless compression.
21. Two common lossless compression algorithms are:
22. Wider applications: Genetics compression algorithms (not to be confused with genetic algorithms) are the latest generation of lossless algorithms that compress data
23. Fill in the blanks for RLE
24. In the following picture we compress …
25. Run-length encoding isn’t a very effective option when compressing texts, but for images …