Tone and light: the tonal range from light to dark; how tone describes three-dimensional form, creates mood and atmosphere, and directs the eye; chiaroscuro and high- and low-key effects.

What this dot point is asking

Tone is the lightness or darkness of an area, and it is the formal element that models form, sets mood and leads the eye. This dot point is about the tonal range, how tone describes three-dimensional form, how it creates atmosphere, and the named effects (chiaroscuro, high-key, low-key). Controlling tone is central to convincing drawing and painting, so it feeds AO3 (recording), AO2 (media control) and AO4 (visual language).

The tonal range

Tone is measured from light to dark, and the single most common weakness in student work is using too narrow a range, everything crowding into the middle greys. A drawing reads with depth only when it uses the full range: genuine highlights, genuine darks, and the mid-tones between. Squinting at a subject reduces it to tonal masses and helps you see the range.

Tone models three-dimensional form

The most important descriptive job of tone is to make a flat surface look like a solid form in space. Light falling on a rounded object produces a predictable sequence, and reproducing that sequence is what makes the object read as three-dimensional.

Tone creates mood

Because tone carries atmosphere, the overall tonal key of an image sets its emotional register before colour or subject. This is one of the most powerful tools of visual language.

• Low-key images are dominated by dark tones with small areas of light and high contrast; they feel dramatic, sombre or mysterious.
• High-key images are dominated by light tones with little dark and low contrast; they feel airy, gentle, calm or fragile.
• Chiaroscuro is the deliberate use of strong contrast between light and dark to model form dramatically and heighten mood (associated with Caravaggio and Rembrandt).

Tone leads the eye

Tonal contrast is a compositional tool: the eye is drawn to the area of greatest contrast or the brightest light. You can place your focal point where the lightest light meets the darkest dark, and quieten the rest with closer tones. This makes tone a way to organise a composition, linking this element to composition and visual organisation.

Try this

Q1. Name the tonal sequence that models a lit, rounded form. [Knowledge recall]

• Cue. Highlight (brightest point), mid-tone (turning surface), core shadow (darkest band where the form turns from the light), and reflected light (lighter area within the shadow), with a cast shadow below; all depending on a single main light source.

Q2. Explain the difference between high-key and low-key tonal effects and the mood of each. [Short explanation]

• Cue. High-key is mostly light tones with low contrast, feeling airy, gentle or fragile; low-key is mostly dark tones with small lights and high contrast, feeling dramatic, sombre or mysterious (the basis of chiaroscuro), so choosing a key sets the emotional register of an image.