Spectral and RGB Colour

$0.00

Clear

Description

To find out more about the diagram above . . . . read on!

Spectral and RGB Colour

Look carefully at the diagram at the top of the page. Now check out the following questions (and answers)!

  1. What are spectral colours?
  2. What are RGB colours?
  3. What are secondary colours?
  4. Can ROYGBV each be produced by a single wavelength of light?
  5. Can RGB be produced by combining other wavelengths of light?
  6. Can the spectral colours orange, yellow and violet be produced by combining primary colours?

About the Diagram

Introducing the diagram! Read back and forward between the image at the top of the page and the explanation below!

This diagram shows the six spectral colours associated with the colours of the rainbow.

  • The top half of the diagram shows that each of these spectral colours can be produced by a single wavelength of light.
  • The bottom half of the diagram shows that three spectral colours (red, green and blue) can be combined in pairs to produce orange, yellow and violet.

Remember that:

  • Spectral colours are produced by a single wavelength of light. So each individual wavelength of visible light produces a different spectral colour.
  • Rainbows are produced by spectral colours as sunlight is refracted and dispersed by raindrops.
  • Red, orange, yellow, green, blue and violet are familiar spectral colours.
  • The visible spectrum contains a continuum of spectral colours.
  • The wavelength corresponding with each colour is shown in nanometres (nm). The wavelengths selected for each colour are for illustration only.
  • In practice, the choice of wavelengths for primary colours usually depends on factors such as the colour model being used, the gamut of colours that a display device can produce and the context in which colours are to be viewed.

Remember also:

  • The visible spectrum is a small part of the electromagnetic spectrum.
  • Spectral colours should not be confused with RGB colours.
  • Spectral colours relate to the visible spectrum.
  • RGB colours are produced by mixing wavelengths using the three primary colours, red, green and blue.
  • A demonstration of RGB colour is often presented in the form of a colour wheel.
  • In a continuous spectrum of wavelengths, separate colours are indistinguishable to the human eye.
  • The fact that we see distinct bands of colour in a rainbow is an artefact of human colour vision.

Follow the blue links for definitions . . . . or check the summaries of key terms below!

Some Key Terms

Move to the next level! Check out the following terms.

Electromagnetic spectrum

The electromagnetic spectrum includes electromagnetic waves with all possible wavelengths of electromagnetic radiation, ranging from low energy radio waves through ...
Read More

Primary colour

Primary colours are a set of colours from which others can be produced by mixing (pigments, dyes etc.) or overlapping ...
Read More

RGB colour

To be clear about RGB colour it is useful to remember first that: The visible spectrum is the range of ...
Read More

Spectral colour

A spectral colour is a colour evoked in normal human vision by a single wavelength of visible light, or by ...
Read More

Visible spectrum

The visible part of the electromagnetic spectrum is called the visible spectrum. The visible spectrum is the range of wavelengths ...
Read More

Wavelength

Wavelength is a measurement from any point on the path of a wave to the same point on its next ...
Read More

More Information

ABOUT SLIDES

Slides


Some images on this website are available for download as either slides or diagrams.

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.
Diagrams are optimized for printing on A4 pages in portrait format.

ABOUT DIAGRAMS

Diagrams


Some images on this website are available for download as either slides or diagrams.

Diagrams share common specifications:

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

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

FILE TYPES - JPG

JPG file format


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

AI (Adobe Illustrator) file format


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

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.