Week 5: Exposure/Light and Dark

Light Quality

Light is either direct or diffused.

Direct light: the light strikes the subject from one angle and creates sharp shadows. Sunlight is an example of direct light.

Diffused Light: the light hits the subject from many angles and creates soft shadows. The light is diffused on an overcast day or in the shade.

Measuring the Light

Exposure is the amount of light that comes into the camera to create the photograph.

Exposure is made up of three components:

1. ISO-Sensitivity to light.
2. Shutter Speed-the length of time that the camera’s shutter is open during the exposure.
3. Aperture-how wide the cameras lens opens to allow the light to come in.

https://images.app.goo.gl/paiAeMEtVoyr123z8 Aperture, shutter speed, iso

All three are measured in stops.

How your Camera Meter Works

Acronym: TTL – Through the Lens

The meter in your camera is a reflected-light meter.

A reflected light meter averages the tones in the scene and selects the aperture and shutter speed values that will make the whole scene medium gray.

https://youtube.com/watch?v=Axt9zLxdE8s%3Ffeature%3Doembed

Watch from :45 to 1:34 for an explanation of how your camera meter works.

Using Exposure for Creative Effect

Sometimes, you don’t want the tones in your image to average out to a medium gray. You want to tones to be low key-mostly dark or high key-mostly light.

How to control exposure

With a cameraphone: Touch the area where the main subject is and then drag the little sun icon up or down to increase or decrease the overall exposure.

With a camera: Use Exposure Compensation to take the two photos.

Exposure Compensation-a way to force the camera to make an exposure either lighter or darker than the meter reading. Good for backlight or extremes of light and dark.

Light and Dark

The word photography is rooted in Greek meaning “ writing with light “  One of the main concerns of photographers is how light illuminates a scene or subject. While we focus attention on light, it’s easy to not pay attention to shadows. Shadows, although dark, can be as dynamic as light. The shadows shape light, define texture, and act as compositional elements. 

Contrast: The measure of difference between bright areas (highlights) and dark areas (shadows) in a photo

High contrast : Large difference between highlights and shadows. Mostly lights and darks without many mid tones  

Low contrast :  Little difference between lights and darks. Mostly mid tones

Shadows –  dark areas in photo that can range from black with no detail to dark tone with detail

Uses of light and shadow: Light and shadow are complementary elements in photography. The quality and direction of light affect how a subject looks while  producing shadows in various forms

1. Contrast and Drama :  Shadows can be used to create contrast to produce a dramatic effect. Attention of the viewer is drawn to tonal contrast which can not happen without shadows. In this interplay of light and shadow, the lighting effect is enhanced by the shadows.  

2. Shadows can be used to direct the viewer’s attention. Shadows can be be shapes that may be used as compositional elements  to direct attention to the center of interest in a photo. Also shadows can surround a light area to make it a center of interest

3. Reveal form: Using shadows will give form to subjects and make them look more three dimensional. The shadows don’t necessarily need to be black for this to happen. As long as one part of subject is light and one part is darker the photo will look more three dimensional. For dramatic effect, direct light will produce dark shadows. But for some subjects, dark hard shadows can be distracting or cause loss of detail. For subjects where detail is important, using partially diffused light will make soft shadows that will show form and maintain detail. 

4. Reveal texture: Side light with shadow will show texture

5. Shadows can be shapes and patterns that can be used to complete a composition.

How light falls on your subject is key to using shadows in photography. The best direction for a combination of light and shadow will be light coming from the side. For dramatic effect photograph when the light( direct light ) is at a lower angle which  will produce longer dramatic shadows. For less dramatic effect, use slightly diffused light or totally diffused light.

Exposing for photos that contain light and dark areas you will need to use exposure compensation. If there is large dark areas in the photo, the meter will over expose the light areas. In this case you need to use exposure compensation to lower the level of the lighter areas. 

LAB5