Binary, Bits, and Bytes
How is digital information stored?
Digital information is stored in bits.
How does a computer convert text into binary code?
Computers change text into binary code by assigning a number to each character in the alphabet. That number is then translated into bits.
How is analog data different from digital data?
Analog data is data that changes smoothly, over time. Ex: music, colors, a painting, VHS, Cathode Ray TVs. Digital data changes in an on/off manner.
What is lossless compression?
Lossless compression is the process of reducing the size of an image by using symbols to represent patterns of data to reduce the number of bits without losing any information.. The compression can be restored to its original.
What are the two settings of a bit?
Off and on (0 and 1).
What is the assigned ASCII values for Y, u, and r?
89 117 114
How is a low frequency sample different from a high frequency sample? (think about the black and white goose image)
The goose image with the higher frequency sample looked closer to the analog version of the goose. That is because it had a higher sample frequency
When is it appropriate to use lossless compression?
It is appropriate to use lossless compression when sending files that you do not want to lose any information from, such as text files or program files.
What do you call a group of 8 bits?
A group of 8 bits is called a byte.
What is abstraction?
Abstraction is the way that computers represent complex information and process in a simple and accessible way.
What is a secondary color?
Any of the colors that can be made from mixing 2 primary colors in different amounts.
What is lossy compression?
Lossy compression is the process by which computers reduce the size of a file by cutting out information. The compression cannot be fully restored to the original information.
How many total numbers can be represented with 8 bits?
What is a real-world example of abstraction? Be sure to name both the simple task and the complexity hidden behind it.
Example: It is easy to use an automatic coffee maker because you can easily create coffee from pressing a button. You don't have to worry about the complexity of boiling the water, how it runs through the tubes in the machine, how it mixes with the grounds, etc. All you have to do is turn it on.
How many ways are there to represent the color red using 6 bits in RGB?
3
When is it appropriate to use lossy compression?
When posting an image to instagram, using less data sending it, downloading a movie from Netflix.
How many ways are there to represent the color yellow, magenta, or cyan using 6 bits?
9
Why does a photo that you upload to Instagram have lower quality than the photo saved to your phone?
It is better because smaller file sizes allow users to upload, download, and interact with content more efficiently.