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Year 10 - Computing

Representing bitmap images

Representation of text, images and sound

Unit Summary

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.

Lesson Summary

You will learn to describe how computers represent bitmap images.

Key Notes

  • A pixel is the smallest element in an image.
  • A bitmap image is one that is represented by a grid of pixels.
  • The colour a pixel should display is described by a binary sequence.
  • The colour depth of a bitmap image quantifies the number of bits used to represent each pixel.
  • The resolution of an image describes the total pixels an image contains based on its width and height.

Vocabulary To Learn

  • pixel: a single element of an image on a computer screen
  • colour depth: the number of bits used to represent the colour of each pixel, which is also known as bit depth
  • resolution: total amount of pixels an image contains based on its width and height expressed in pixels

Common Mistakes To Avoid

  • Bitmap images that are large on screen are always poor quality.

3 Quick Questions (With Answers)

1. Describe the system or process from this lesson in clear steps.

A pixel is the smallest element in an image. A bitmap image is one that is represented by a grid of pixels.

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: Bitmap images that are large on screen are always poor quality. Correction: The quality of a bitmap image depends on its resolution, not just its size on the screen. A high-resolution bitmap can appear sharp and detailed, while a low-resolution bitmap may look pixelated when enlarged.

More Lessons In This Unit

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