Additive Color System
colors based on RGB—red, green, blue. All three mixed equally = white

Aperture
hole to control the amount of light entering the camera; can be made smaller or larger

Autofocus
the sharpest part of the image will be the area you place in the focus area in the viewfinder center

Autoexposure
measures light reflecting from the scene and uses the readings to set the exposure

Autoflash
autoexposure system will fire the camera’s built-in flash if the light is too dim.

Automatic White Balance
the camera automatically adjusts the color balance so that white objects look white in the photo

Bit-maps
the image is divided into a grid of pixels. The values stored control the brightness and color of each pixel in the grid. This control is called bit mapping; digital images are bit-maps.

Depth of Field
the depth from foreground to background that will be sharp in the photograph. Changing the aperture changes the depth of field

Digital Zoom Lens
takes a part of the normal image falling on the sensor and enlarges it to fill the sensor (interpolation)

Exposure
when shutter opens, each pixel on the image sensor records the brightness of the light that falls on it by accumulating an electrical charge. When shutter closes, charge from each pixel measured and converted into a digital number

F-stops
aperture settings

Flash Modes
Auto—camera fires the flash when light is too low
Anytime Flash—fires the flash no matter how much light
Red-eye Reduction—fires a separate lamp to reduce red-eye in portraits
Flash Cancel—turns the flash off
Slow Synchronized—keeps the shutter open longer than usual to lighten the background

Focus
determines which parts of the picture will be the sharpest

Framing the Image
composing the image through the viewfinder