Lossy/Lossless Compression
What is the most important quality of lossless compression?
A) The data is transformed to usually make it smaller. It can always be re-constructed back to the original.
B) The data is transformed to always make it smaller. It can always be re-constructed back to the original.
C) The data is transformed to usually make it smaller. It cannot always be re-constructed back to the original.
D) The data is transformed to always make it smaller. It cannot always be re-constructed back to the original.
A) The data is transformed to usually make it smaller. It can always be re-constructed back to the original.
The number base of the binary number system.
What is 2?
A single tiny dot, or square, of color in a digital image.
What is a pixel?
The process of simplifying complicated data into manageable chunks.
What is data abstraction?
This term protects original works of authorship, such as books, music, and artwork.
What does the term "copyright" protect?
What should you consider when choosing between lossy and lossless compression for a specific task? HINT: There are 2 things you should consider.
BOTH file size and desired data quality.
The number of possible values that can be created with only 2 bits.
What is 4?
Red, green, and blue.
What are the 3 color channels that make up a pixel according to the RGB color scheme?
The number of bits that are used to encode a character according to the ASCII encoding scheme.
What are 8 bits?
What IP stands for when we talk about ideas, inventions, and creations.
What is intellectual property?
What happens when you unzip or decompress a file that was compressed using lossless compression?
A) The file returns to its original, uncompressed state without loss.
B) The file becomes smaller.
C) The file loses some data.
D) The file quantity improves.
A) The file returns to its original, uncompressed state without loss.
State 1 similarity and 1 difference between the binary and decimal number system.
Possible answers:
Similarities:
Differences:
Which of the following would result in a better digital approximation of an analog black and white image?
A) Increasing the size of each sample square, thus decreasing the number of samples taken.
B) Decreasing the size of each sample square, thus increasing the number of samples taken.
C) Using fewer bits to represent the image.
D) Using decimal numbers to represent each pixel.
B) Decreasing the size of each sample square, thus increasing the number of samples taken.
This is eight bits grouped together.
What is a byte?
How is a Creative Commons license different from a regular copyright?
It allows your work to be shared, reused, and remixed to help spark more creativity.
You’ve been given a new cell phone with a 2 gigabyte data plan. You plan to use your phone for text messages and videos. Which of these categories are best compressed using lossless compression? Which of these categories are best compressed using lossy compression? Why?
Text should use lossless because it already has a small file size and it’s important to be able to reconstruct the original message for communication purposes.
Video should use lossy compression because it usually has a large file size which we need to reduce so we don’t use up all our data.
Each time we add another bit, what happens to the amount of numbers we can make?
With each bit, we can make twice as many numbers as before.
Which statement about analog and digital images is true?
A) With advances in technology, digital images look exactly like the analog images they represent.
B) Sampling an analog image more frequently produces a digital image with a better representation.
C) Analog images come from data that is measured at regular intervals.
D) Digital images come from data that is measured continuously.
B) Sampling an analog image more frequently produces a digital image with a better representation.
What is the purpose of character encoding in digital information?
To encode text characters into binary.
This is when someone copies your artwork without permission.
What is infringement?
An author is preparing to send their book to a publisher as an email attachment. The file on their computer is 1000 bytes. When they attach the file to their email, it shows as 750 bytes. The author gets very upset because they are concerned that part of their book has been deleted by the email provider.
If you could talk to this author, how would you explain what is happening to their book?
Just because the file is smaller doesn't mean that information is lost - it just means the email automatically compressed the data.
Modern car odometers can record up to a million miles driven. What happens to the odometer reading when a car drives beyond its maximum reading and what is it an example of?
The odometer "turns over" reverting to zero and losing the leftmost digit. This is a classic example of overflow.
Describe how the process of RGB pixels and binary sequences work together to display a digital color image.
Each pixel contains a certain amount of red, green, and blue light. Each pixel has a certain amount of bits used to store the information. If we have 12 bits, there would be 4 bits each to store the amount of red, green, and blue light. Those bits are what the computer uses to display the colors on the screen.
In digital language, what does ASCII stand for?
A) American Standard Code for Internationalization
B) Alphabetical Symbol Code for Information
C) American Standard Code for Information Interchange
D) All-purpose Symbolic Character Instruction
C) American Standard Code for Information Interchange
This is an exclusive right to use a symbol or logo to represent a brand.
What is a trademark?