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subtractive mixing – why not RGB?
In a previous post I spoke about the difference between additive and subtractive mixing and why the additive primaries are red, green and blue or RGB for short –...
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chromaticity diagram and RGB gamut
You may well have seen a typical diagram showing the chromaticity diagram and the gamut of an RGB monitor. The gamut is a triangle, of course, with the vertices formed by the chromaticities of the RGB...
View ArticleHow many colours are there?
I sometimes begin a series of student lectures on colour with the question – how many colours are there? At least one student always answers: three! In fact, this week in my lecture when I asked this...
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RYB primaries
There are two phrases I keep seeing written down all over the internet that cause my blood pressure to increase. The first is that the colour primaries are red, yellow and blue (RYB). And the second is...
View Articlecolour management for beginners
Colour displays are now affordable and enjoyed by consumers at work, at home, on mobile displays and in cinemas. Consumers often take it for granted that there is good colour fidelity as images are...
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Race for colour
The films were made by a young British photographer and inventor called Edward Turner, a pioneer who can now lay claim to being the father of moving colour film, well before the pioneers of...
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race for colour
Over the summer I was asked to take part in a BBC documentary about the recent discovery of the first colour movie film that was fond at the National Media Museum (Bradford). I met the presenter...
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colour correction for iphone
Of course, one of the reasons (but by far not the only one) that the iphone has been so successful is the quality of the camera that is built in. It was certainly one of the features that made me...
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grab colour – use it
Many of you will have seen the Scribble Pen which uses a colour sensor to detect colours. The sensor is embedded at the end of the pen opposite the nib. The pen then mixes the required coloured ink...
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 Articleaccurate colour on a smartphone or tablet
Electronic displays can vary in their characteristics. Although almost all are based on RGB, in fact the RGB primaries in the display can vary greatly from one manufacturer to another. Colour...
View ArticleRGB displays are more complicated than you think
Most people assume that display screens are based on RGB – that is the amount of red, green and blue light emitted is controlled in three signals. We tend to think that there is an RGB ‘value’ at each...
View Articlegrab colour – use it
Many of you will have seen the Scribble Pen which uses a colour sensor to detect colours. The sensor is embedded at the end of the pen opposite the nib. The pen then mixes the required coloured ink...
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 Articleaccurate colour on a smartphone or tablet
Electronic displays can vary in their characteristics. Although almost all are based on RGB, in fact the RGB primaries in the display can vary greatly from one manufacturer to another. Colour...
View ArticleRGB displays are more complicated than you think
Most people assume that display screens are based on RGB – that is the amount of red, green and blue light emitted is controlled in three signals. We tend to think that there is an RGB ‘value’ at each...
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