Computer Science

accepting a limitation to achieve a beneficial outcome

Bitmap file size calculation

Representation using binary sequences

Representing text using Unicode and ASCII

Text file size calculations

Representing bitmap images

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

Place the following file sizes in order from smallest to largest:

What determines the file size of a bitmap image?

suitable for printing or detailed graphics

What happens when the colour depth of an image is increased?

What is the effect of increasing the resolution of an image?

Which of the following is a trade-off when reducing image resolution?

What is the basic unit of data in a computer system?

Which character encoding system uses up to 32 bits per character?

How many states are possible with a sequence of 4 bits?

Bitmap file size calculation

Lesson outcome