Ryan discusses the four light elements: color, angle, intensity, and quality. Color is made up of red, green, and blue particles called photons. Angle refers to the orientation of these particles when they reach your eye--they have a horizontal component as well as a vertical one. Intensity is how much energy is present in each photon; higher-intensity lights are more powerful. Quality is how that power is distributed across the spectrum of colors. Low-quality lights have more of their energy in lower-frequency colors (blue vs. white light). High-quality lights are more balanced.
Light can be described by its color, but it is more useful to discuss its effect on the eye. Blacklight posters and fluorescent lamps emit light of all colors at once, but we see only those that match the color of our retinas. Red lights can make us feel hot because blood cells absorb more red light than other types of cells. Yellow lights do not cause blindness because the rods cells in our eyes are sensitive to yellow light. Blue lights can cause headaches or nausea if they're strong enough, which is why dark rooms contain fewer bugs for you to annoy with your belches.
Light is responsible for many natural phenomena, like sunset colors and sunrise shades.
The fundamental principles of lighting are light quantity, energy usage, and light quality. Other factors include safety and aesthetics.
Light quality refers to the color of light. The three main types of light are white, colored, and black. White light is composed of waves of all frequencies that appear white to our eyes. Colored light is made up of different wavelengths that produce colors when mixed together. Black light is completely dark; it does not contain any wavelengths that can be seen by humans. Artificial lights use filters to change the color of light from incandescent lamps, which are mostly white, to blue for sodium vapor lamps, which are mostly red.
Light quality has a big impact on how we use energy. If we want to reduce energy consumption, one option is to use low-quality light sources such as fluorescent tubes or halogen bulbs. These devices are efficient at producing light, but they are also very inefficient at converting electricity into heat. They also contain toxic materials that can lead to asthma attacks if they are broken down chemically. High-quality light sources like compact fluorescents or light-emitting diodes (LEDs) use less energy and are safer because there are no toxic substances involved in their production.
What are the differences between diffused, backlit, and reflected light? And when should they be used?
Diffused light is light that comes from a single source and is spread out by particles in the air. This type of light is most commonly seen at night when there are no clouds in the sky and moonlight is able to pass through clouds to illuminate objects beyond their immediate surroundings. Sunlight is also diffuse light since all surfaces absorb some amount of light, this is why you can see farther into the shadows when the sun is out than when it is not. Light bulbs emit very little diffusion so they are not suitable for use as natural-looking background lights.
Backlit light is directed light that falls on an object from a direction opposite to that of the subject. In other words, if you were to map out a scene with an imaginary line running down the middle and labeled "backlit" and "not backlit," everything on one side of the line would get light from behind them, while everything on the other side would get light from in front of them. Backlit lights are used to light subjects from the rear or the side. They are common in photography and videography because they do not require any special optical effects to make objects look 3D.
The Four Lighting Elements
Line, color, value, shape, form, space, and texture are the seven elements. Each of these will be discussed in depth below.
Line: The line quality of light determines how well shapes can be defined. All else being equal, straight lines are better defined by lights with a smooth beam than those with a sharp one. Smooth beams produce more even light across their width, while sharp beams cause shadows to appear as thick black bars.
Color: Color is the name given to all types of light other than white or monochromatic (single-color). The colors of light are determined by its spectrum, which is the range of wavelengths it contains. Sunlight has both red and blue wavelengths, for example, while tungsten light bulbs emit only yellowish-white light.
Value: Value is the amount of light that is absorbed by an object, such as a leaf or a rock. The darker an object, the more light it absorbs. Dark objects are said to have high values, while light ones have low values.
Shape: Shape is how an object's surface appears when illuminated by light. Flat surfaces such as tables and floors reflect most of the light that hits them, while round objects like balls and lamps scatter light in many directions.
The main (and most powerful) light source in a scene or on an actor is referred to as key lighting. Fill lighting provides richness and softens the harsh shadows cast by the main light. Backlighting is used to assist clarify the actor's features and separate them from the backdrop. Accent lighting, such as that which falls on one particular object in a scene, creates interest and emphasis where it does not already exist.
There are two types of key lights: hard and soft. Hard key lights are those that strike directly onto the subject; for example, the sun is often used as a hard key. Soft keys produce a more even distribution of light across the face; for example, an office lamp would be considered a soft key. The type of key light used affects how the shot will appear lit-from-within.
An important consideration for lighting actors is determining how much light they should receive. Too much light can cause glare on the camera lens and overexpose the image, while not enough light can make the actor look like a silhouette. Actors' eyes also contain many tiny blood vessels that reflect light when photographed; this is why people appearing in photographs usually have white clothes with darker shades offset by a few black or dark blue items. These items absorb some of the visible light but transmit most of the infra-red radiation, making the person look human-like rather than pixelated.
Creating light using 3D modeling The artist creates a mix of light sources to bring attention to a specific region of the stage or to portray natural qualities of the environment, such as the time of day. When employed for commercial reasons, lighting may play an even more vital role. A well-lit storefront draws customers inside, while an unlit storehouse does not.
Lighting is important for visual effect and to avoid shadows that would hinder the viewer's ability to understand the shape and form of objects on the stage. Lighting is also used to create atmosphere. For example, if you were to visit a cemetery at night, you would need lighting to see where you were going and what objects were around you.
Types of lighting There are two types of lighting commonly used by artists when creating scenes for theater: artificial and natural. Artificial lights are created by burning substances such as hydrogen or oxygen (or their compounds) with energy from a battery or generator. These chemicals produce heat, which is why they are called "heat sources." The amount of heat produced depends on the type of fuel used. For example, hydrogen produces only water when burned, so it is considered a clean fuel. On the other hand, gasoline produces carbon dioxide and water when burned, so it is not considered clean. Other artificial light sources include mercury vapor, sodium, and xenon.
Natural lights are forms of radiation that come from the sun or other stars.