4.5.6.4 Bitmapped graphics

Question 1

How is a bitmapped image represented?

Answer 1

The image is divided into pixels, and each possible colour has it’s own bit pattern. Every pixel is then stored in order in memory with metadata about the image also being stored.

Question 2

What data would be stored about a line in Vector graphics?

Answer 2

The start and end point’s x and y coordinates are stored, the thickness of the line and the colour.

Question 3

What is colour depth?

Answer 3

The number of bits used to store each colour

Question 4

What is resolution?

Answer 4

The number of pixels per width and height

Question 5

What are the advantages of vector graphics over bitmapped graphics?

Answer 5

Less storage space is likely to be needed and the image will load faster and also download faster. The image can be resized without distortion or loss of quality. You can more easily manipulate the objects in the image.

Question 6

Why does no distortion occur when resizing vector graphics?

Answer 6

Vector graphics store the properties and coordinates of an object, it uses mathematical equations to generate objects. This means that these properties can be re-scaled and the drawing can be re-rendered.

Question 7

What data would be stored about a circle in Vector graphics?

Answer 7

The coordinates of the midpoint of the circle, the length of the radius.
The line colour, width, fill colour etc.

Question 8

How do you calculate storage requirements for bitmapped images ?

Answer 8

storage requirements = resolution x colour depth

but bitmap image files may also contain metadata.