ASSESMENT 2: COLOUR
Provide a written and Illustrative evidence that demonstrates that you understand how the following colour systems work on a computer:
- Colour modes:
· RGB (additive): System for representing the colours in a screen by the combination of red, green, and blue. Levels of R, G, and B can each range from 0 to 100 percent of full intensity. The range of decimal numbers represents each level from 0 to 255. The total number of available colours is 256 x 256 x 256
· CMYK (subtractive): It is used for printing. The colour are made by the mixing cyan, magenta, yellow and black.
· Hexadecimal (hex): the colour is represented by hexadecimal values. The code itself is a hex triplet, which represents three separate values that specify the levels of the colours. The code starts with a pound sign (#) and is followed by six hex values or three hex value pairs. Example: #FFFF00 (yellow)
· HSB: HSB stands for Hue, Saturation and Brightness. According to this model, three numbers represent any colour. The first number is the hue, and its value ranges from 0 to 360 degrees. Each degree represent a distinct colour. First, there is the red colour (0 or 360 degrees) and then there are all other colours up to the violet colour. The second number is the saturation. It represents the amount of colour or, more exactly, its percentage. Its value ranges from 0 to 100, where 0 represents no colour, while 100 represents the full colour. Finally, the third number is the brightness.
- Hue: Refers to the attribute of a visible light due to which it is differentiated from or similar to the primary colours. The term is also refers to colours that have no added tint or shade.
- Saturation: Colour saturation refers to the intensity of colour in an image. It determines how certain hue will look in certain lighting conditions.
- Tone/brightness: Brightness is the perception of how intense the light coming from a screen is. It can be measured in terms of the amplitude of the light being emitted from a screen.
- Grey scale: Collection or the range of grey shades, ranging from white on the lightest end to pure black on the opposite end. It only contains luminance (brightness) information and no colour information
- The use of histograms: It is a representation of the distribution of colours in an image. Represents the number of pixels that have colours in each of a fixed list of colour ranges that span the image's colour space, the set of all possible colours.
- Transparency: The “pigment” of the colour decrease making the colour to be transparent. This value can be adjusted.
- Alpha channels: It is a colour component that represents the degree of transparency (or opacity) of a colour. It determines how a pixel is rendered when blended with another.











