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 switch from Nokia about 3 years ago after more than 15 years of loyalty to the swedish brand. So I was interested to read recently that the next iphone may feature advanced colour correction methods and promises to be even better than its predecessors. You can read about the story here.
Colour correction is necessary because different cameras use different RGB primaries and because the activation of the RGB sensors when taking an image depend upon the quantity and quality of the ambient illumination. So, for example, imagine the light was very very red, then the R channel of the camera would be more strongly activated than if the light was whiter. However, our visual systems are able to compensate for this so that most of the time we don’t notice objects changing colour when we move from one room to another or from inside to outside. Colour correction is inspired by human colour constancy and attempt to correct the images so that the objects in the scene would retain their daylight appearance. However, colour correction is difficult; that is, it is very difficult to get it right all of the time. One frustration I have is taking a photo of my band (I play drums in a covers band) under very colourful lighting. Often the images are very disappointing and lack the intensity of the original scene. That is because, human colour constancy is only partial and under extreme lighting things really do change colour markedly – such as under our intense LED stage lighting. In these cases I think sometimes the automatic colour correction is actually too much and I have found that I have to modify the images I capture on my mac to try to recreate what I think the original scene looked like. So auto colour correction – the state of the art – is certainly not perfect. Let’s hope this story about an advance made by Apple is true.
When I was young, differently flavoured crisps came in distinctly different coloured bags; plain crisps were red, cheese and onion were green and salt and vinegar were blue. Generally these colour codes are still used today – at least in the UK. However, one manufacturer (Walkers) is breaking these long-standing rules.
Research at the University of Oxford was recently reported that concludes that the colour of the bag can affect the taste of the crisps inside because of our expectations. It turns out that crisp manufacturers are putting pressure on Walkers to sort their act out and conform to the old rules.
ps. For readers in the USA, we are talking about potato chips.
Excellent article based on an extract from Nina Jablonski’s book “Living Colour: The Biological and Social Meaning of Skin Colour” about early ideas about the relationship between skin colour and personality.
The first scientific classification of humans, published by Carl Linnaeus in 1735, was simple and separated people into four varieties by skin colour and continent. Later, Linnaeus added that Europeans were white and “sanguine,” Asians were brown and “melancholic,” Native Americans were red and “choleric” and Africans were black and “phlegmatic”. Of course, these racist pronouncements were based on prejudice and myth and little, if any, factual information. Nevertheless, these ideas led to an intellectual foundation for racism. Immanuel Kant, was the first to formally define races and in 1785 classified people into four fixed races, which were arrayed in a hierarchy according to colour and talent. It sounds like a really interesting book on anthropology and I’ll order a copy tomorrow. I’ll try to remember to comment when I have read the full book.
Four temperaments is a proto-psychological interpretation of the ancient medical concept of humorism and suggests that four bodily fluids affect human personality traits and behaviors. The temperaments are sanguine (pleasure-seeking and sociable), choleric (ambitious and leader-like), melancholic (introverted and thoughtful), and phlegmatic (relaxed and quiet).
What is it about taxis that makes colour so controversial?
In 2009 I posted about the situation in Derby (UK) where the council introduced a new rule saying that all official taxis should be yellow and then got into trouble when they said that one taxi driver’s taxi was not exactly the right shade of yellow. How did they specify the colour?
A couple of years later there was a major political storm over a proposal for Durham (also UK – ooops …. embarrassing!!!) to adopt white as the official taxi colour.
Then in 2012 I wrote about taxi colour in Beijing. Well, this was not exactly news but by now taxi colour was starting to interest me!!
But guess what? Today, another genuine taxi colour story. This time it is in USA. The D.C. Taxicab Commission’s One Color Panel recommended Wednesday that District taxis be coloured red. Apparently, “Red is a color that is strongly associated with the District, both among residents and visitors,” the colour panel said in a statement. “The Stars and Bars of the District flag are red. Each of the major sports franchises in the District has a shade of red as a prominent part of the uniform. In the area of transportation, both the District’s Circulator bus and the Capital BikeShare vehicles are red.” All taxis will be required to change to the new colour within five years.
According to a recent study eye colour plays a role in deciding how trustworthy others will think you are. Researchers simply asked a group of people to rate the trustworthiness of male and female faces. It was found that a majority of people found people with brown eyes to appear more trustworthy. This was true for both sexes but particularly so for men.
But it turns out that it is face shape that is more important and eye colour is a major factor because brown-eyed people tend to have certain facial characteristics. For the original story see here.
Looks like an interesting online colour course here.
Unfortunately, only the first video (which simply talks about what you will learn in the others) is free. To watch the others you need to have paid a subscription. Shame.
Most humans are trichromatic; that is, our colour vision is mediated by three types of light receptor in our eyes. These receptors are known as cones and the three types have peak sensitivity in different parts of the colour spectrum. We sometimes refer to these as LMS cones because of their peak sensitivity at long-, medium- and short-wavelengths light.
Some people (men, in the main) are colour blind and this is because they are anomalous trichromats (they have three cones but the spectral sensitivities are less optimal than they should be or they are dichromats (they are missing the L, M or S cone types). But what about other species?
Most mammals are dichromats including dogs and cats. However, many fish and birds have better colour vision than do we humans. I just came across an article that reports that chicknes have five cones compared with our three. The research has been conducted the Washington University School of Medicine in St. Louis (USA). It is suggested that birds often have more cones than we do because they descended directly from dinosaurs and never spent any part of their evolutionary past living in the dark.
Another simulator on the market that shows you what your image or website would look like to someone who is colour blind. This one is from a company called ETRE – for further details see http://www.etre.com/tools/colourblindsimulator/
In the image series below the left image is normal and the ones in the middle and right show protonopia and deuteranopia respectively.
For more on colour blindness see my earlier post.
In July of this year the UK is hosting the 12th International Congress of the International Colour Association. We have received over 600 submissions from people who would like to present their work and so it looks as though we can have a very successful conference. If you have an interest in colour then this is the place to be this year – for further details visit http://aic2013.org/
A new study by academics at the University of Colorado suggests that the colour ink you use when providing comments and feedback to students can alter their perception of criticism and place unnecessary blame on the teacher for bad marks or feedback. According to the researchers teachers should use a blue pen if they want their comments to be taken in a constructive manner. The full research paper is available online here.