Solved: Colours are represented by a computer as a combination of the three primary... [IB Computer Science (CS)]

Question

SLPaper 1

Colours are represented by a computer as a combination of the three primary colours: red, green and blue.

Numerical values are used to represent the different shades of each primary colour. These values range from 0 to 255 in decimal, or 00 to FF in hexadecimal.

State the maximum number of colours that can be represented in a computer pixel.

[1]

Verified

Solution

Method #1

2^{24} = 2^8 \times 2^8 \times 2^8 = 256 \times 256 \times 256 = 16777216

Therefore, the maximum number of colors that can be represented in a computer pixel is 16777216.

State the number of bits used to represent a non-primary colour, such as yellow.

[1]

Verified

Solution

Award $1 max$ .
24;

State why hexadecimal numbers are frequently used in computing.

[1]

Verified

Solution

Method #1

Hexadecimal numbers are used for shorter representation of data because a (modern) byte can be represented exactly by two hexadecimal digits; 1 mark

Method #2

Hexadecimal numbers are used for shorter representation of data, because computers store and handle binary digits, and four binary digits make one hexadecimal digit; 1 mark

Colours are represented by a computer as a combination of the three primary colours: red, green and blue.

Method #1

Method #1

Method #2

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