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.

To discuss the effect of colour depth and resolution on the size on an image file

The colour depth effects the amount of colours that can be displayed in the image. If you were to increase the colour depth you could increase the amount of colours displayed. However if you were to decrease the colour depth it would pick the 4 or how much colour depth you want amount of colours and then display only them. The resolution size effects the quality of the image by either making more of the pixels or less. It could also reduce the amount of storage that the image takes so it takes less time to load.