Chapter 1 Digital Data Flashcards
What is data?
Data consists of raw facts and figures and is unprocessed.
What is information?
When data is processed it produces information.
So information is ‘data with meaning’
How many bits are in a Nibble?
4 bits
What is a numeric data type?
An Integer number: can be a positive or negative whole number and has no decimal or fractional parts.
Real numbers: include whole numbers and numbers with decimal/fractional parts and can be positive or negative.
What is a pixel?
It is the smallest unit in a digital image that can be displayed and edited
What are
3 characteristics of a pixel?
Each pixel can have its own individual colour and is stored as a series of BITS. Combining pixels together will produce a complete image.
The quality of an image is referred to as ‘image resolution’.
The greater the resolution, the greater the file size.
A typical JPEG image uses 24 bits to store a pixel.
What are 3 characteristics of Bitmap graphics?
Bitmap graphics store details about every single element of the image.
Storing every pixel means the file size of a Bitmap image can be very large.
A Bitmap image can also be compressed, which reduces the file size.
What does a BIT stand for?
Binary digit
What are 2 characteristics of vector-based graphics?
They store information about the components that make up an image.
Components are based on mathematical objects such as lines, curves and shapes.
When zoomed in the quality of the image remains the same.
