Ittens Seven Contrasts.

Contrast of Tone...

• Juxtaposition of light and dark/monochrome values.
• Orange is a lighter tone or red and grey is a lighter tone of black.
• Colours like red and blue have a large tonal contrast.

Contrast of Hue...

• The greater the distance between colours on the colour wheel, the greater the contrast.

Contrast of Saturation...

• Light and dark values and their relative saturation.

Contrast of Proportion...

• Weight of colour.
• Dark is heavy, white is light.
• A good example of this is violet and yellow which fight for hierarchy. A small amount of yellow can balance a larger amount of violet.

Contrast of Temperature...

• Warmth of colour.
• Red is warm, blue is cool.

Complimentary Contrast...

• Every pure colour has one complimentary.
• If a colour is without its complimentary the eye will attempt to generate it.

Simultaneous Contrast...

• Merging of colours.
• High contrast against low.
• In the same field of view multiple contrasts can happen.