The maths behind RGB images

In this lesson students explore the colour model RGB (Red, Green, Blue) commonly used in digital imaging and display systems and why there are 256 colours using mathematical understanding of powers. Students convert decimal numbers (numbers that use the digits 0 to 9) to binary.

Additional details

Year band(s) 7-8
Content type Lesson ideas
Format Web page
Core and overarching concepts Digital systems, Data representation
Australian Curriculum Digital Technologies code(s)

Investigate how digital systems represent text, image and audio data using integers


Explain how and why digital systems represent integers in binary

Keywords pixel, images, colour model, bytes



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