Data Representation Flashcards
How many bytes are in a megabyte?
1 million
What is the effect of the logical binary shift right?
The number is divided by 2
What is the effect of the logical binary shift left?
The number is multiplied by 2
Why is hexadecimal used in colours?
It’s a human-friendly representation of values in binary code
What is meant by a character set?
All of the characters that a computer can use
What is an overflow error in binary addition?
When the end result is larger than can be stored
How does increasing the image resolution affect the file size?
It increases the size of the file
Explain the relationship between image quality and file size
The higher the image quality, the higher the file size
State two factors that affect the file size of a bitmap image
Image quality and resolution
How do you calculate the file size of an image?
Image height x image width x bit depth
What is metadata?
Data that describes other data (e.g date modified)
What would you need to do in order to improve the accuracy of the recording?
Increase the sample rate
What is lossy compression?
Compression in which some of the information is permanently eliminated
What is lossless compression?
Compression in which all the original data can be recovered when the file is decompressed
