series of pixels, which are small dots of colour that are arranged in a grid. Each pixel can be represented by a binary code, which is processed by a computer
The resolution of an image
refers to the number of pixels in the image. A higher resolution image has more pixels and is, therefore, sharper and more detailed but also requires more storage space
Colour depth
refers to the number of bits used to represent each colour. A higher colour depth means that more colours can be represented, resulting in a more realistic image but also requires more storage space
E.g. an 8-bit colour depth allows for 256 different colours to be represented (28=256), while a 24-bit colour depth allows for over 16 million different colours to be represented (224=16,777,216)
The file size of an image increases as the resolution and colour depth increase. This is because more pixels and colours require more binary data to represent them
The quality of an image also increases as the resolution and colour depth increase. However, it's important to balance the desired quality with the practical limitations of storage space
An image has a resolution of 600 x 400 and a colour depth of 1 byte. Calculate the file size of the image giving your answer in bytes. Show your working
600*400=240000
Lossy Compression
Reduces file size by permanently removing data from the file
