Olympus E-1 - Manual (Page 175)

175
Miscellaneous
12
Glossary of terms
A (Aperture Priority) Mode
You set the aperture yourself and the camera automatically varies the shutter speed so that the
picture is taken with the correct exposure.
AE (Automatic Exposure)
The camera’s built-in exposure meter automatically sets the exposure. The 3 AE modes available
on this camera are P mode, in which the camera selects both the aperture and shutter speed, A
mode, in which the user selects the aperture and the camera sets the shutter speed, and S mode,
in which the user selects the shutter speed and the camera sets the aperture.
In M mode, the user selects both the aperture and the shutter speed.
Aperture
The adjustable lens opening which controls the amount of light that enters the camera. The larger
the aperture, the shorter the depth of field and the fuzzier the background. The smaller the
aperture, the greater the depth of field and the sharper the background. Aperture is measured in
f/stops. Larger aperture values indicate smaller apertures, and smaller aperture values indicate
larger apertures.
CCD (Charge-Coupled Device)
This converts light passing through the lens into electrical signals. On this camera, light is picked
up and converted into RGB signals to build a single image.
Center weighted averaging metering
A light metering mode or technique that uses an average of the center and periphery of the image
area but is biased toward the information at the center of the image area. This method is best
used when the brightness of the center and periphery of the image area does not vary greatly.
See also digital ESP metering and spot metering.
Color space
A model that describes colors using more than three coordinates. Color spaces such as sRGB,
Adobe RGB are occasionally used for encoding/reproducing colors.
Color temperature
The spectral balance of different white light sources is rated numerically by color temperature — a
concept of theoretical physics that, with incandescent lighting, corresponds roughly to the
absolute lamp filament temperature, expressed on the Kelvin (K) temperature scale. The higher
the color temperature, the richer the light in bluish tones and the poorer in reddish; the lower the
color temperature, the richer the light in reddish tones and the poorer in bluish. You may
encounter difficulties with color reproduction when shooting indoors under fluorescent lighting, or
where sunlight and fluorescent lighting are both present. Your camera is provided with a white
balance adjustment feature that you can use to compensate for the odd effects of combinations of
color you may occasionally see in your pictures.
Compression rate
Compression is a method of reducing file size by abbreviating some contents of data, and
compression rate denotes the amount of compression. The actual effect of the selected
compression rate could vary with the content of the image. The numbers for the compression rate
selected with this camera provide only a general scale for reference and are not precise
measurements.