Computer Science

a single element of an image on a computer screen

the number of bits used to represent the colour of each pixel, which is also known as bit depth

total amount of pixels an image contains based on its width and height expressed in pixels

Representing bitmap images

Representation using binary sequences

Representing text using Unicode and ASCII

Text file size calculations

Bitmap file size calculation

Representing sound

Calculation of sound file size

In this unit, pupils will discover how letters, images and sounds are represented with binary digits. They will also explore the factors that impact the quality of those representations and investigate the effects these quality choices have on file size.

Representation of text, images and sound

Which term refers to an image format that is composed of a grid of individual pixels, each with its own colour value?

What determines the quality of a bitmap image?

What is the smallest element of a bitmap image?

Which term describes the number of bits used to represent the colour of each pixel in an image?

Allows for 16.7 million different colours.

The basic unit of data within a computer system that has the value 0 or 1

Matches characters to a unique binary sequence

Which character representation method uses 8 bits per character?

What is the method of character representation that uses up to 32 bits per character?

How many possible states are there in a sequence of 3 bits?

Representing bitmap images

Lesson outcome