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Photography vocabulary Exposure is how light or dark an image is. An image is created when the camera sensor (or film strip) is exposed to light—that’s where the term originates. A dark photo is considered underexposed, or it wasn’t exposed to enough light; a light photo is overexposed or exposed to too much light. Exposure is controlled through aperture, shutter speed and ISO (more on those last two in a bit). Exposure is also subjective—there is no “right” exposure.