Light Theory
The electromagnetic spectrum consists of regions of waves of different wavelengths. One particular area is the visible light region. The colour of light is determined by which wavelength is reflected back to your eyes.
White light is a mixture of several colours, each of which has different frequency. When wight light is passed through a prism (triangular glass block) it can be split into it separate colours. The white light is refracted when it goes through the prism and each colour is refracted by different amounts, leading to the light being spread and forming a spectrum of different colours.
White light is a mixture of several colours, each of which has different frequency. When wight light is passed through a prism (triangular glass block) it can be split into it separate colours. The white light is refracted when it goes through the prism and each colour is refracted by different amounts, leading to the light being spread and forming a spectrum of different colours.
When light hits an object some of it is absorbed and some of it is reflected. The light reflected is the colour we see the object as; for example a yellow object absorbs all colours of the spectrum except yellow so it appears yellow. Digital imaging commonly uses the three primary colours of light which are blue, green and red- these are also known as the additive colour system and when these are mixed together it creates white light. The human eye automatically adjusts to the colour of light, however cameras do not. In cameras colour filters are used to match the colour of light source to the white point of film so the light will appear white.