Light & Science Flashcards
(30 cards)
What are the three principles of lighting?
Size of Light Source, Types of Reflections that are possible on surface, Family of Angles
What key factor is needed for good lighting?
Planning
What is Light?
Light concerning photography is a type of energy called electromagnetic radiation.
How does electromagnetic radiation travel?
Through bundles called Photons.
What is a Photon
pure energy with no mass, fluctuates when it travels.
Electromagnetic Field
Field produced by the energy of photons.
What types of energy run through electromagnetic fields, and how do they run?
Electrical and Magnetic, running oppositely (maximum to minimum) perpendicular to one another, remaining at a constant 0.
What we see as color is caused by
The frequency at which photomagnetic fields fluctuate.
How are electromagnetic fields measured?
In hertz, which determines its frequency. (The number of complete wavelengths that pass a certain point within a second)
How are photographs effected by ultraviolet light?
Modern cameras and film are sensitive to a wider range of electromagnetic fields, degrading images.
What are the three most important characteristics that determine quality of light?
Brightness, Color, and Contrast.
What is the color temperature scale based on?
The color something will glow when it is heated.
How do we measure color temperature?
Degrees of Kelvin.
What is ironic about how we describe color temperature?
A color described as cool (blues) is derived from the result of being a physically hotter color than colors described as warm. (yellow/red)
Name Daylight and Tungsten color temperatures.
5500K = daylight, 3200 or 3400 are tungsten.
How is high contrast created?
When light rays from a source strike a subject from a single angle.
How is low contrast created?
When light rays from a source strike a subject from many different angles.
How can you tell a high-contrast light source from a low-contrast light source.
It’s shadow will be of one darkness with sharp edges for high-contrast. For low contrast light, the shadow will have different intensities and a less detailed edge.
What is the terminology of high-contrasted shadows and light sources.
Hard lights, hard shadows.
What is the terminology of low-contrasted shadows and light sources?
Soft light, soft shadow.
Name two factors of light sources that will determine if it creates a hard or soft shadow.
Distance (far away = hard) and size (small=hard)
Shadow
Parts of a scene that light does not strike.
Highlight
Part of a scene that a light directly strikes.
What factors of a a light source determine the quality of an images highlights?
Large light sources produce soft, large highlights while small light sources produce small, hard highlights.
