1.2.4 Data Storage (Images)

Question 1

How is an image represented by a series of pixels and in binary?

Answer 1

Images also need to be converted into binary in order for a computer to process them so that they can be seen on our screen. Digital images are made up of pixels. Each pixel in an image is made up of binary numbers. - BITMAP

Question 2

What is metadata?

Answer 2

To create the picture, a grid can be set out and the squares coloured (1 – black
and 0 – white). But before the grid can be created, the size of the grid needs be known. This data is called metadata and computers need metadata to know the size of an image. In other words metadata describes the structure of the data file and is usually located right at the start of the file.

Question 3

What is colour depth?

Answer 3

The number of bits used to store each pixel is called the colour depth.

Question 4

How does the resolution effect the quality of the image?

Answer 4

In a low-resolution image, the pixels are larger so fewer are needed to fill the space. This results in images that looks blocky or pixelated. An image with a high resolution has more pixels, so it looks a lot better when you zoom in or stretch it. The downside of having more pixels is that the file size will be bigger.

Question 5

What is the number of pixels used called?

Answer 5

resolution