Aperture: The opening in the lens that controls how much light
hits the camera's image sensor. The aperture is an iris in the lens that can be opened or
closed to allow more or less light into the camera. The smaller the aperture the less
light it allows to enter through the lens. This is one of the ways a camera regulates
exposure.
Aperture Priority: A larger aperture (opening) allows more light for a brighter
image. This is very useful when taking pictures at night or in a dark room. Reducing the
aperture can control light in environments that may be too bright. During Aperture
Priority Mode on Toshiba Digital Cameras the Shutter and Flash are automatically set to
optimize performance.
Artifact: Misinterpreted information from a JPEG or a similarly compressed image;
includes defects that appear in an image as color flaws or skewed lines.
Artificial light: Light from a man-made source, usually restricted to studio photo
lamps and domestic lighting.
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