Apples and oranges may look very different if you see colour well, but if not, from a distance they can be hard to distinguish.Ĭolour provides a means to differentiate, and the lack of being able to do so causes a loss of information (that there are two different types of fruits on this stall), and thus presents an accessibility barrier. One such example is the ability to identify different fruits that may be on sale on a market stall. One of the main difficulties that people with these conditions have is that, due to their more limited spectrum of colour perception, they can miss out on important information that is innately apparent to other people who have good colour vision. However, it would be great if there was more we could do to provide information to someone who can see colour, but just not all colours… Addressing the fundamental problem Great examples such as those above are to be lauded and will always be best practice. Providing two different ways of conveying the same information redundantly (be it colour and shape, or sight and sound) is proven to be beneficial to everyone’s perception. Example HTML code that may be used for including images that are differentiated by colour and shape, and supply appropriate alt text Coupled with a text alternative for the images, this is a robust accessibility technique that helps many users. GitHub uses shaped status indicators so that their colour isn’t the only thing that indicates success or failure. The use of shapes as well as colour is a great technique. More information on games and colour deficit can be found below. Frozen bubble in “standard” mode with colours differentiating the bubbles Frozen bubble using shapes to help differentiate the bubbles There is an option to include prominent shapes within the bubbles, so that shape can be used as a differentiator too. A range of colours are used and, whilst they are quite close to the primary colours, they could be hard to discern. Frozen Bubble, for example, involves matching bubbles of different colours. Some computer games offer settings to make things clearer for people with colour perception difficulties. The fundamental solution to this problem, which also helps people with no colour perception, is to not rely on colour alone to convey information-use position, size, shape and other visual characteristics (as well as a textual equivalent for people who cannot see). A very well-known condition is “red-green colour blindness” (there are actually two different sub-types of this, deuteranomaly and protanomaly), though there are several other types of colour deficit. Many people in the world have some difficulty in perceiving colour. The last part discussed “invert brightness”. This is the last in the current series of articles looking at adaptations for accessibility, based on new techniques or research.
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