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AP CSP lossless vs lossy compression study guide

Study guide covering the concepts of lossless and lossy compression, including definitions, examples, advantages, disadvantages, and applications in computer science.

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Lossless Compression Definition

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A method that reduces file size without losing any data. Examples include PNG and ZIP.

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1. What is the primary purpose of lossless compression?

Terms in this Study Set(24)

Flashcards 1(12)

Lossless Compression Definition

A method that reduces file size without losing any data. Examples include PNG and ZIP.

True or False: Lossy compression can restore original data.

False. Lossy compression permanently removes some data to reduce file size.

Example of lossless compression

PNG images, FLAC audio, ZIP archives.

Compression Technique Comparison

Lossy reduces size significantly; lossless retains all original data.

Fill in the blank: JPEG is a form of _____ compression.

Lossy compression.

Effect of lossy compression on quality

Reduces file size but may degrade image or audio quality based on compression level.

Question: Why use lossless compression?

To preserve data integrity; essential for text files and certain image types.

True or False: All audio formats are lossless.

False. Formats like MP3 use lossy compression.

Example of lossy compression

MP3 audio, JPEG images, MPEG video.

Comparison of data recovery

Lossless: Complete recovery possible. Lossy: Original data cannot be restored.

Question: What is a common use for lossy compression?

Streaming media to reduce buffering and save bandwidth.

What does ZIP do?

ZIP compresses files using lossless methods, maintaining original file integrity.

Flashcards 2(12)

Lossless compression definition

Compression that allows the original data to be perfectly reconstructed. Examples: PNG, FLAC.

True or False: Lossy compression retains all original data.

False - Lossy compression eliminates some data, reducing quality.

Example of lossy compression

JPEG image format reduces file size by discarding some visual details.

Fill in the blank: Lossy compression sacrifices ___ for reduced file size.

Quality

Main advantage of lossless compression

No data loss; exact original data can be restored.

Comparison: Lossy vs. Lossless

- Lossy: smaller size, reduced quality - Lossless: larger size, original quality

When to use lossless compression?

Use when data integrity is critical, like text documents or legal files.

Question: What is a common lossless format?

Examples include ZIP and BMP.

Cause → Effect: Lossy compression leads to...

Smaller file sizes but potential visual or audio quality loss.

What does 'bitrate' refer to?

Amount of data processed per time unit in digital audio or video.

Impact of lossy compression on streaming

Reduces buffering and loading times, improves user experience.

Describe a situation needing lossless compression.

Archiving text documents where every character must remain unchanged.

Questions in this Study Set(24)

1. What is the primary purpose of lossless compression?

A.To reduce file size without losing any data.

B.To improve file quality.

C.To make files easier to share.

D.To eliminate unnecessary metadata.

2. What is the main purpose of lossless compression?

A.To preserve original data

B.To reduce data integrity

C.To enhance visual quality

D.To increase file size

3. Which of the following file formats uses lossy compression?

A.FLAC

B.PNG

C.JPEG

D.ZIP

4. Which of the following is an example of lossy compression?

A.FLAC

B.PNG

C.MP3

D.ZIP

5. True or False: Lossless compression can always restore the original file perfectly.

A.True

B.False

C.Only for images

D.Only for audio

6. True or False: Lossy compression maintains all original data.

A.True

B.False

C.Partially True

D.Depends on the format

7. What effect does lossy compression typically have on media quality?

A.It improves the quality.

B.It reduces the file size and may degrade quality.

C.It creates a backup of the original file.

D.It is unnoticeable to the average user.

8. Fill in the blank: Lossy compression sacrifices ___ for reduced file size.

A.Speed

B.Quality

C.Data integrity

D.Color depth

9. Which compression method is ideal for text files?

A.Lossy compression

B.ZIP compression

C.MPEG compression

D.JPEG compression

10. When should you choose lossless compression?

A.For high-resolution images

B.For streaming music

C.When data integrity is critical

D.For video files

11. Which of the following is NOT a characteristic of lossy compression?

A.It allows for significant file size reduction.

B.It retains all original data.

C.It may degrade quality.

D.It is used for streaming media.

12. Which of the following formats is NOT lossless?

A.BMP

B.ZIP

C.JPEG

D.FLAC

13. What is a common application of lossy compression?

A.High-resolution printing

B.Streaming audio and video

C.Archiving data

D.Database storage

14. What does 'bitrate' indicate in audio compression?

A.File size

B.Amount of data processed per time unit

C.Visual quality

D.Compression ratio

15. Which of the following formats is an example of lossless compression?

A.MP3

B.JPEG

C.FLAC

D.MPEG

16. What is a key effect of lossy compression on streaming?

A.Increased file size

B.Reduced buffering times

C.Loss of all data

D.Improved audio fidelity

17. What does the ZIP format primarily do?

A.Encrypts files.

B.Compresses files using lossless methods.

C.Converts file types.

D.Manages media playback.

18. How does lossless compression differ from lossy compression?

A.Lossless is slower

B.Lossless retains original quality

C.Lossy is larger in size

D.Lossless is only for images

19. True or False: All audio formats are lossless.

A.True

B.False

C.Only classical music formats

D.Only recent formats

20. Which of the following is a common lossless format?

A.MP3

B.JPEG

C.ZIP

D.M4A

21. Which of the following is an effect of using lossless compression in images?

A.It significantly lowers resolution.

B.It maintains the full quality of the image.

C.It is not usable for web graphics.

D.It increases file size.

22. What is a potential downside of lossy compression?

A.Increased file size

B.No data loss

C.Visual or audio quality loss

D.Faster processing time

23. What is the main advantage of lossless compression over lossy compression?

A.It reduces file size more effectively.

B.It preserves the original data.

C.It is faster to execute.

D.It requires less storage space.

24. Describe a scenario where lossless compression is necessary.

A.Streaming music

B.Archiving text documents

C.Storing videos

D.Editing images

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AP CSP lossless vs lossy compression study guide

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