Year 9 - Computing
Representing images with binary data
Data representation: images and sound
Study Hub
Study Guides
This pupil-friendly study guide includes a unit summary, clear notes, common mistakes, and quick questions with answers.
Unit Summary
In this unit, pupils will focus on digital media such as images and sounds, and discover the binary digits that lie beneath these types of media. They will explore how images and sound can be manipulated and consider the link between quality of images and sound and the resulting file size.
Lesson Summary
You will learn to explain how images are represented using binary digits and created using the RGB system.
Key Notes
- Digital pictures are formed out of individual pixels (picture elements).
- The elements in a digital image are arranged in a grid of rows and columns.
- The colour of a pixel can be represented as a mixture of red, green and blue.
Vocabulary To Learn
- pixel: a single element of an image on a computer screen
- bit: a binary digit, the basic unit of data within a computer system that has the value 0 or 1
- RGB system: a colour model used to represent and create colours by combining three colours of light: red, green and blue
- intensity: the strength of a colour, shown by the value of each element (red, green or blue)
Common Mistakes To Avoid
- The number of bits per pixel that represent the colour are always individual specific colours.
3 Quick Questions (With Answers)
1. Describe the system or process from this lesson in clear steps.
Digital pictures are formed out of individual pixels (picture elements). The elements in a digital image are arranged in a grid of rows and columns.
2. Define this computing term and give one practical example. 'pixel'
a single element of an image on a computer screen. Add one real device or system example to prove understanding.
3. Correct this common computing misconception.
Mistake: The number of bits per pixel that represent the colour are always individual specific colours. Correction: When RGB is used to define the colour of a pixel the bits represent different intesities of red, green and blue providing different colour mixes.
More Lessons In This Unit
Browse all guides in the Year 9 Computing guide library.