Photographs produced by digital cameras are made up of using only 3 colours. These are 3 primary light colours and they are red, green and blue. Do not get these confused with primary paint colours. They are very different. Take your photograph by placing your head in the oval space and press the button.

What happens when you use the coloured filters?

 

 

 

The basic process that is carried out by digital cameras is to change light waves (analogue information) into digital information (binary numbers).

 The light that bounces off your face travels to the digital camera.

 

The light sensor inside the camera changes the light information into digital information. This digital information is used by the tiny computer inside the camera. The information is then sent to the screen where you can see the image of your face.

The image that you see is made up of 3 primary light colours 

—red, green and blue (RGB)

The combination of these colours makes up all the colours that you see.

In the digital camera a photoelectric light sensor (CCD device) changes the light waves into digital information (bits) that the computer can process. The sensor is made up of millions of pixels or "buckets" that collect charge in response to light. The charge produced will be presented by a 1 or 0 (binary code). Each coloured dot (pixel) is presented by a 0 or 1. Computers use binary numbers 0s and 1s to do all there calculations. The computer can read these numbers and use them to make the image we see. 

 

 

Light and dark

Light and Shadows

How we see things