Pixels and resolution
Explain the representation of an image as a series of pixels represented in binary
The image can be displayed as a series of pixels in binary because the different colours can be different numbers. E.G 1010 could be blue. This means that the more bits inside the binary code the more colours can be used. As long as the bits keep on increasing there can be infinite amounts of colours used in the image.
Explain the need for metadata to be included in the file such as height, width and colour depth.
The need for metadata is to convert raw data into a picture. If the metadata is not supplied you would never know when to stop and start on the picture with the pixels. The metadata gives the computer system the information on how many colours there are, how high the picture is and how long it is. Without this the image would just be one strip of colour going on forever. The metadata could also be used as a key.