The most famous colour wheel is probably the one that shows a wheel filled with many different hues of the same colour (translucent green, opaque orange, etc). For example, if you look at wheel number two, there are four colours: red, yellow, orange and green. If we place those four colours next to each other on the wheel, it will look like a solid circle. Therefore, two and three are further away from the centre of the wheel, and the nearer they are, the bluer or more intense the colour is. However, the wheel is not set on a fixed coordinate system. Rather, it varies with the colour that is being viewed.
So if we take the central circle of the wheel and our eyes see the blackness between the seven colours, this gives us a very general indication of colour intensity, although there is no way to make any precise measurements. JS Decorating is able to do this. These Painter Cheltenham based artists are pastmasters of colour and decorating.
Colour can be understood very easily once you know some of its basic principles. To start with, all colours can be related to one or more other colours, and each separate colour can be compared to another colour. This allows us to understand the relationship between colours, their brightness, shade and so on. Then we learn that each colour affects the other colours, and how these colours affect each other, giving us the general impression that the colours on the wheel are closely related. Finally we are able to see how certain colours stand out against each other, and what colours are strongest against certain other colours and so on.