Module 1.3
Extension Task 1 - Colour Graphics


A.M.D.G.

Different colours cannot be represented using only 1 bit.

2 bits allows us to use four colours.

e.g. 00 = white 01 = red 10 = green 11 = blue

10
00
01
11
11
01
00
10
10
00
01
11
11
01
00
10
10
00
01
01
01
01
00
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
10
00
01
01
01
01
00
10
10
00
01
11
11
01
00
10
10
00
01
11
11
01
00
10
=
               
               
               
               
               
               
               
               

Using 4 coloured pencils convert this binary to a colour image. Write which colours you will use below.

00 =                      01 =                      10 =                      11=                      

00
00
11
01
01
11
00
00
01
11
10
10
10
10
11
01
01
11
10
11
11
10
11
01
10
11
10
11
11
10
11
10
10
11
10
11
11
10
11
10
01
11
10
11
11
10
11
01
01
11
10
10
10
10
11
01
00
00
11
01
01
11
00
00
=
               
               
               
               
               
               
               
               

Answer the following questions in your jotter:

1. If an image is black and white, how many bits are required for each pixel?
2. If an image has 4 colours, how many bits are required for each pixel?
3. If an image has 8 colours, how many bits are required for each pixel?
4. If an image has 16 colours, how many bits are required for each pixel?
5. If an image has 256 colours, how many bits are required for each pixel?
6. An image has a resolution of 640 x 480 pixels. How much memory is required to store this image in memory if:
(a) The image is black and white?
(b) The image has 8 colours?
(c) The image has 256 colours?