Explore: Vision


Vision-related diagrams

Each diagram can be viewed on its own page with a full explanation.

Why an Object Appears Red in Sunlight
Why an Object Appears Orange in Sunlight
Why an Object Appears Yellow in Sunlight
Why-an-Object-Appears-Green-in-Sunlight (svg) 02000-0-A-BL-EN
Why an Object Appears Blue in Sunlight
Why an Object Appears Violet in Sunlight
Why an Object Appears Cyan in Sunlight
Why an Object Appears Magenta in Sunlight
Why an Object Appears Transparent in Sunlight
The Human Eye and RGB Colour
A Rainbow is an Optical Phenomenon
Observed Colour of Raindrops
Introduction to Vision
Human Eye in Cross Section
Human Eye in Cross Section
Retina of the Human Eye in Detail
Human Eye Eyeball and Retina
Response of the Cone Cells in the Human Eye to Colour (svg) 11010-0-A-BL-EN
Sensitivity of Eye to the Colour Spectrum (svg) 11000-0-A-BL-EN

All images are free to download

Download slides


Most images on this website are available for download as either slides or illustrations.

Slides share common specifications:

  • Titles: Slides have titles.
  • Backgrounds: Black.
  • Size: 1686 x 1124 pixels (3:2 aspect ratio).
  • Slides are available in two file formats: JPG, AI (Adobe Illustrator).

Slides are optimized for viewing on-screen or with a projector.
Illustrations are optimized for printing on A4 pages in portrait format.

Download illustrations


Most images on this website are available for download as either slides or illustrations.

Illustrations share common specifications:

  • Titles: No titles.
  • Backgrounds: White.
  • Size: 1686 pixels wide. So all illustrations reproduce at the same scale when inserted into Word documents etc.
  • Labels: Calibri 24pt Italic.
  • Illustrations are available in two file formats: JPG, AI (Adobe Illustrator).

Illustrations are optimized for printing on A4 pages in portrait format.
Slides are optimized for viewing on-screen or using a projector.

File types: JPG


Download the image at the top of this page as a JPG file:

  • All JPG images available for download are 1686px wide.
  • Text on JPG images with white backgrounds is styled as Calibri 24pt Italic.
  • If the image you need is not exactly right, download it as an AI (Adobe Illustrator) file and edit it.
  • All the images on these Resource Pages were created in Adobe Illustrator and are vector drawings.

Did you know:

  • JPG stands for Joint Photographic Experts Group who created the standard.
  • The JPG file extension is used interchangeably with JPEG.
  • JPG files can be compressed for use on websites.
  • JPG files can be placed or pasted directly into MS Office documents.

File types: AI


Download the image at the top of this page as an AI (Adobe Illustrator) file:

  • All AI images available for download from lightcolourvision.org are 1686px wide.
  • All the images on these Resource Pages were created in Adobe Illustrator and are vector drawings.
  • Vector drawing can be scaled up or down without any loss of quality.

Did you know:

  • AI files downloaded from lightcolourvision.org can be re-edited using Adobe Illustrator for your own personal use.
  • Adobe Illustrator can save or export AI files to other formats including PDF (.pdf), PNG (.png), JPG (.jpeg) and SVG(.svg) etc.

Download agreement

Download Agreement


Before downloading or cutting and pasting from lightcolourvision.org we ask you to agree to the following terms:

  1. All information, images and other assets displayed or made available for download on the lightcolourvision.org website are copyright. This means there are limitations on how they can be used.
  2. All information, images and other assets displayed or made available for download are solely and exclusively to be used for personal, educational and non-profit purposes.
  3. When you find the resources you need, then part of the download process involves you (the user) ticking a box to let us (at lightcolourvision.org) know we both agree how the material can be used.
  4. Please contact [email protected] before considering any use not covered by the terms of the agreement above.

If you are a student, educator or researcher you might also like to read our posts Copyright: Credit where credit’s due and Citation and bibliographies before copying and pasting material into essays, assignments or other academic work. They include advice on avoiding plagiarism and how to credit other people’s words, images and assets before submitting your work for marking or assessment. If you are confused, just ask a friendly teacher, librarian, or other member of academic staff.


Like to know more?

Please contact [email protected] if you have questions about any aspect of this project.