Linda From Maine wrote:
Welcome to part 2 of a four-part discussion series on the aspects of light. If you missed part 1, you can find it
hereAfter part 4 has concluded, we will offer a follow-up discussion in which we invite you to share your impressions and what you took from the series that you can apply to your own goals and interests.
This project is the result of a collaborative effort among several members and we hope to make the series a success with your participation. Many thanks to all!
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Today's topic discusses the qualities of
harsh and
soft. What do these terms mean and how do these two aspects of light contribute to mood, emotional impact, story? Here are a few general characteristics, related terms and examples:
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Harsh - Resulting from an intense (very bright), direct light source and producing high-contrast images with dark shadows. Used at an angle, harsh light (aka
hard light) can accentuate textures. Examples: outdoors under mid-day sun, indoors with direct flash or a lamp without a covering; a spotlight.
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Soft - Non-directional light that generally produces lower contrast and indistinct shadows. Examples: outdoors in
open shade or when the weather is cloudy, foggy or hazy; indoors often achieved with the use of
reflectors, diffusers, or natural light through a window. Fog, mist and haze can emphasize depth as contrast and colors lessen with distance. Reflected light is easily found in
nature.
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Fill flash can add controlled brightness to a subject.
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High key: the use of unnaturally bright lighting to eliminate harsh shadows. Images are often described as feeling upbeat and happy.
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Low key: these images contain mostly dark tones and colors, with selective use of light and shadow to create a dramatic mood.
In addition to the embedded links above, for those interested in further study I posted more links
herePlease share an image that represents a quality mentioned above, and discuss how the light affects mood, story and emotional impact.Thanks very much for participating!
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Welcome to part 2 of a four-part discussion series... (
show quote)
Many of us learned lighting terms a little differently, about 35 to 40 years ago. We think in terms of specularity. A *specular reflection* (specular highlight) is a mirrored image of the light source. Examples might be the sun, reflected off of a chrome car bumper, or a 7-foot umbrella, reflected off of an entire human face, or a 32" umbrella, reflected off the same subject's left cheekbone. Each has a different degree of specularity.
What you have called "hard" or "point source" light yields highly specular reflections. The ratio of the specular highlight to the diffuse highlight (the rest of the light falling directly on the subject from some source) is high.
What you've called "soft" or "diffused source" light yields specular reflections that are essentially the same size as the subject. In a scene lit with only one broad source (earth on a completely overcast day, or portrait subject lit by a giant umbrella) The ratio of the specular highlight to the diffuse highlight is 1:1, or close to it. (The entire subject reflects the light source, so the specular highlight and the diffuse highlight are the same thing.)
The diffuse highlight on a subject lit with a mix of sources is that part of the scene that is NOT usually a specular highlight or a shadow. It is lit by open sky, a studio fill light, reflected light from the rest of the environment, etc.
Shadows are, of course, those parts of a scene not lit by either a main light source, or the predominant fill light source. Examples might be the side of a person lit only by ground reflections on a sunny day, when photographed from a low angle (back to sun AND sky), or the part of an egg that is mostly dark, compared to the specular highlight created by a side light.
There is also a useful term called "shadow edge acuteness", which is a measure of how stark the transition is from diffuse highlight to shadow. Those who photograph products for a living know how important this is. If you mix light sources (i.e.; point sources such as peanut strobes, and broad sources such as strobes in large soft boxes, light tents, and umbrellas), you can vary the intensity (ratio) of BOTH the diffuse highlight and specular highlight, along with the shadow edge acuteness. In all cases, distance is the key. The size of the light source, *relative to the size of the subject,* controls specularity.
A good exercise in lighting is to photograph a matte black Cross pen sitting on shiny black Plexiglass. You'll have to mix BOTH a hard source (which gives the pen an edge highlight) and a broad source (to outline the pen shaft's roundness), all the while choosing an angle that does NOT reflect either source off the black Plexiglass as a specular highlight.
Some photographers have been known to use silvered surface soft boxes with a small hole cut into the diffusion material center. This allows a small amount of "hard" light to shine through, while the surrounding diffusion material provides the fill. Put the light source on a movable shaft inside the soft box, and you can vary the ratio between the direct, diffused source, and the direct, pinpoint source, just by moving the lamp or flash tube forward or backward in the box. Having TWO light sources in the same soft box is also useful.
The sun is 1000 times bigger than the earth. But it is 93 million miles away, so it is a highly specular point source when not diffused by clouds or smog. Light sources in small reflectors (4" to 6") are highly specular at distances greater than 7' or so. Used at an angle, they reveal surface details and create harsh shadows. Kicker lights used for portraits of old, weathered faces and product photos are often point sources for this reason.
A 7-foot umbrella wraps light all around a close subject, so it hides zits, pores, and other surface imperfections on a face. It also illuminates hair extremely well, and creates large highlights on dark, shiny objects. So if you are going to photograph a black cat in a coal bin, you want that! Black objects are visible ONLY when they reflect specular highlights. So wrap them in light. The same light works well when photographing models for cosmetics ads. It hides all the imperfections in skin that the makeup doesn't conceal. I laugh every time I see a cosmetic ad with "before" and "after" photos. The "before" photo is usually made with harsh lighting, while the "after" photo is made with umbrellas and reflectors, and maybe a ring light.