CS - Data Rep - Graphics - Bitmap

Question 1

What are bitmapped graphics?

Answer 1

A bitmapped graphic is a 2D array of pixels

Question 2

What is the resolution?

Answer 2

It is the total number of pixels in an image (usually measured in ppi or dpi)

Question 3

Define and compare bit depth AND colour depth

Answer 3

• BIT depth = number of colours that can be used/stored in an image
• COLOUR depth = number of bits used to represent the colour of each pixel.

(USE YOUR BRAIN TO COMPARE)

Question 4

The more bits allocated to each pixel…

Answer 4

…the larger the file size

Question 5

Describe a high resolution image

Answer 5

• small pixels
• many pixels
• good quality

Question 6

Describe a low resolution image

Answer 6

• large pixels
• fewer pixels
• poor quality

Question 7

Give one advantage and disadvantage of bitmapped graphics

Answer 7

Advanatage - They can be manipulated at pixel level

Disadvantage - The image becomes jagged when scaled