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cure for colour blindness
One of the reasons I enjoy travelling by train is that it gives me an opportunity to read a newspaper from front to back (something I very much enjoy but rarely have time to do). Yesterday I was...
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What is a colour space?
In my job I probably use the phrase “colour space” every day and have done for the last 20 years. So imagine my surprise when I was talking with a colleague recently and after a few minutes he said...
View ArticleColourchat audiovisual guide to the chromaticity diagram
I have discovered a nice plug-in to powerpoint that allows me to synch voice and animations – this is my first attempt. An audiovisual guide to the chromaticity diagram:...
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why is hue circular?
Everyone is familiar with the colour spectrum. If you pass white sunlight through a prism then it splits into the component wavelengths. The shorter wavelengths appear blue, the longer wavelengths...
View Articlewhy are leaves green?
Why are leaves green? The most obvious answer is that they contain green pigments, the most abundant being chlorophyll and that chlorophyll absorbs the short and long wavelengths in the visible...
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homemade colour measurement
Interesting article about a guy who built his own colour-measurement device at home from simple components.
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special females
Our colour vision results from the fact that our eyes contain three types of light-sensitive cells or cones that have different wavelength sensitivity. Some people (called anomalous trichromats) are...
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is there such a thing as visible light?
I would argue that there is no such thing as visible light – or at least that the term visible light is a meaningless one. Light is part of the electromagnetic spectrum which is describes...
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Where is colour mixing?
Imagine that we have three projection lamps at the back of a hall – one has a red filter and so produces a beam of red light, and the other two use filters to produce green and blue beams. We project...
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dog vision
I just read an article in The Daily Mail that says that most people think dogs do not have colour vision. The article then goes on to say that Russian scientists have proved that dogs do have colour...
View ArticleOn CIE colour-matching functions
In 1931 the CIE used colour-matching experiments by Wright and Guild to recommend the CIE Standard Observer which is a set of colour-matching functions. These are shown below for standard red, green...
View Articlehow colour vision works
Really super article by Ana Swanson in the Washington Post about colour vision and how it works. As she explains, it is not really correct to think of the long wavelength visible light as being red. It...
View Articlenon-visual effects of light
Most people know that the ear system has two functions: hearing and balance. It is less well known that the visual system also has two functions. The first is seeing. The second is a set of non-visual...
View ArticleOn CIE colour-matching functions
In 1931 the CIE used colour-matching experiments by Wright and Guild to recommend the CIE Standard Observer which is a set of colour-matching functions. These are shown below for standard red, green...
View Articlehow colour vision works
Really super article by Ana Swanson in the Washington Post about colour vision and how it works. As she explains, it is not really correct to think of the long wavelength visible light as being red. It...
View Articlenon-visual effects of light
Most people know that the ear system has two functions: hearing and balance. It is less well known that the visual system also has two functions. The first is seeing. The second is a set of non-visual...
View Articleinclusivity in sport
I really like this nice awareness video about colour blindness in sport – in football (or soccer, as you may know it) in particular. It is very well done and makes the point that it is not just about...
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