Exposure is a term that relates the amount of light that is “exposed,” or shined upon, the film in a camera when a photograph is taken. When the film is properly exposed, the right amount of light has hit the film for the correct amount of time.
If film is overexposed, then too much light has hit the film for too long. Overexposure results in a photo that has minimal detail in the lighter areas and, therefore, appear to have large whiter spaces.
Conversely, underexposed negatives are produced when not enough light has been in contact with the film. Underexposed film will have more dark spaces that are poorly defined. Many camera manuals will state the camera’s exposure latitude, the range between underexposure and overexposure in which pictures will still turn out.
A photographer can manipulate the exposure for any given shot by opening or closing the camera’s aperture and by altering the shutter speed. Most cameras come with auto-exposure or exposure lock features. Auto-exposure tends to be most useful for amateurs. Experts recommend that you use the exposure lock mechanism in situations with highly contrasting light or with backlighting.
Exposure meters that measure a scene’s light are available to help a photographer calculate the appropriate exposure necessary for a given scene.
Gamma A Gamma Correction, also known as gamma nonlinearity, gamma encoding or just gamma, refers to a nonlinear (logarithmic) equation that encodes or unravels the intensity of light in still photos ...