Direct, diffuse, ambient, and sky light

Separate direct, diffuse, ambient, and sky light to show how an environment illuminates a subject.

What it is

A subject receives light from several influences. Direct light comes from a clear source, while diffuse, ambient, and sky light come from the surrounding environment. You paint these as separate influences on the same object.

Direct light is directional and produces strong highlights and sharper shadows. Diffuse light has softened after bouncing or passing through something. It still has direction, but it fills areas that direct light leaves darker.

Ambient light is low-contrast brightness from many directions. It lifts the darkest values, with higher ambient light producing lighter, softer shadows. Sky light is ambient or diffuse light from the sky. Outdoors, it adds a cool bias to shadow planes and wraps around forms in open shade.

Why it matters

Separating these light types helps explain why one side of a form is bright, why shadows are not pitch black, and why colors shift across a space. Weak separation can make a scene look as if it has one spotlight, overly black or flat shadows, or an outdoor and interior mood that does not match the setting.

You can check it when

✓Label areas in your paintings as direct light, diffuse fill, ambient lift, or sky light in the shadows.
✓Show outdoor shadows with a sky influence that is usually cooler and slightly bluer than the sunlit areas.
✓Build interiors with direct light, softer diffuse fill, and an ambient level that matches the space.
✓Repaint the same object in an overcast day, sunny outdoor, and dim interior setting, changing the balance of direct, diffuse, ambient, and sky light while keeping the form readable.

Direct, diffuse, ambient, and sky light

What it is

Why it matters

You can check it when

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