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Paper 1: Testimonial

Image by ThisisEngineering RAEng

1. Digital Images

Describe how digital images are composed of individual elements
Recall that the colour of each picture element is represented using a sequence of binary digits
Define key terms such as ‘pixels’, ‘resolution’, and ‘colour depth’
Describe how an image can be represented as a sequence of bits

Topic 2 - A Splash of Colour

Topic 1 - Binary Mosaic

Image by Joshua Rawson-Harris

2. Playing with Colours

Describe how colour can be represented as a mixture of red, green, and blue, with a sequence of bits representing each colour’s intensity
Compute the representation size of a digital image, by multiplying resolution (number of pixels) with colour depth (number of bits used to represent the colour of individual pixels)
Describe the trade-off between representation size and perceived quality for digital images

Topic 3 - Collage

Image by Jan Antonin Kolar

3. Combining Images

Perform basic image editing tasks using appropriate software and combine them in order to solve more complex problems requiring image manipulation
Explain how the manipulation of digital images amounts to arithmetic operations on their digital representation
Describe and assess the creative benefits and ethical drawbacks of digital manipulation (Education for a Connected World)

Topic 4 - Good Vibrations

Image by Firmbee.com

4. How Sound is Captured

Recall that sound is a wave
Explain the function of microphones and speakers as components that capture and generate sound
Define key terms such as ‘sample’, ‘sampling frequency/rate’, ‘sample size’
Describe how sounds are represented as sequences of bits

Topic 5 - Sonic Playground

Image by Luke Chesser

5. Playing with sound

Calculate representation size for a given digital sound, given its attributes
Explain how attributes such as sampling frequency and sample size affect characteristics such as representation size and perceived quality, and the trade-offs involved
Perform basic sound editing tasks using appropriate software and combine them in order to solve more complex problems requiring sound manipulation

Topic 6 - Always Another Way

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6. Graphics and Compression

Recall that bitmap images and pulse code sound are not the only binary representations of images and sound available
Define ‘compression’, and describe why it is necessary

Assessment

Unit 17 - Going Audio & Visual

Welcome to this unit, where we explore the art of composing images from individual elements, blending primary colors to create new hues, and sampling analog signals to illustrate these concepts. Through hands-on activities, you will weave these diverse elements into a cohesive narrative.

Central to this unit is a practical approach; you will engage with design software such as GIMP and Audacity to manipulate images and sounds. By doing so, you'll gain insights into how digital representations are employed in real-world scenarios, bridging theory with practical application.

Image by Glenn Carstens-Peters

7. End of unit assessment

Reflection

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