Colour and its meanings...

The eye contains two kinds of receptors - rods and cones, while the rods convey shades of gray, the cones allow the brain to perceive colours.
There's 3 types of cones. The;
1st - sensitive to red-orange light
2nd - sensitive to green light
3rd - sensitive to blue & violet light.

When a cone is stimulated, the brain perceives the corresponding colour. If our 1st cone is stimulated we see "red", if our 2nd is stimulated we see"Green". If these are stimulated simultaneously, we see YELLOW.


Primary & Secondary
Primary colours differ depending on the colour mode (RGB/CMYK), Colours seen when lights shone through a prism are known as Spectrum colours consisting of; RED, ORANGE, YELLOW, GREEN, BLUE, INDIGO AND VIOLET. When the base of the primary colour system is RGB (Additive), these ROYGBIV colours are reduced to red, green, blue and violet.

Secondary Colours are simply created by mixing 2 primary colours, Using the picture as evidence we can see that when you mix red and yellow, produced is ORANGE.


Tertiary
These consist of browns and greys, produced by either mixing all 3 primary colours together OR mixing a primary colour and a secondary colour. There are six tertiary colors; red-orange, yellow-orange, yellow-green, blue-green, blue-violet, and red-violet.

Symbol: Symbolises an Apple (Company name)

Sign: it's reminiscent of Apple products e.g: iPods, iPhones and Apple Macs.

Signifier: Suggests quality, creativity and technology.

Visual metaphor: An object that is a representation of something else e.g. APPLE. A metaphor conveys an impression about something relatively unfamiliar by drawing a comparison between it and something familiar.

Metonym: A symbolic image that is used to make reference to something with a more literal meaning. e.g. a Cross is usually associated with a church.

Synecdoche: When the main subject is substituted for something that is inherently connected to it (A part used to represent the whole) e.g. The Statue of Liberty represents NEW YORK.