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# Contents

- Introduction
- 1 Images and measurements
  - 1.1 Understanding brightness
  - 1.2 Measuring brightness
  - 1.3 Measuring sizes
  - 1.4 Measuring shapes
- 2 Structure in images
  - 2.1 From point-like stars to diverse nebulae
  - 2.2 Exploring the Messier catalogue
  - 2.3 Types of extended objects
- 3 Colour in astronomy images
  - 3.1 Broadband images
  - 3.2 Multiwavelength images
  - 3.3 Narrow-band images
- 4 Mapping the sky
  - 4.1 The Milky Way and the Galactic plane
  - 4.2 Surveying beyond the Milky Way
  - 4.3 Surveying the variable Universe
- Conclusion
- Acknowledgements
- Glossary

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