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Explanation of Terms
EV
A number denotes Exposure Value. The EV is determined by the brightness of the subject and sensitivity (speed) of the film
or CCD. The number is larger for bright subjects and smaller for dark subjects. As the brightness of the subject changes, a
digital camera maintains the amount of light hitting the CCD at a constant level by adjusting the aperture and shutter speed.
When the amount of light striking the CCD doubles, the EV increases by 1. Likewise, when the light is halved, the EV decreases
by 1.
Frame rate (fps)
The frame rate refers to the number of images (frames) that are photographed or played back per second. For example, when
10 frames are continuously photographed in a 1-second interval, the frame rate is expressed as 10 fps.
For reference, TV images are displayed at 30 fps (NTSC).
JPEG
Joint Photographic Experts Group
A file format used for compressing and saving color images. The higher the compression rate, the greater the loss of quality in
the decompressed (restored) image.
Motion JPEG
A type of AVI (Audio Video Interleave) file format that handles images and sound as a single file. Images in the file are recorded
in JPEG format. Motion JPEG can be played back by QuickTime 3.0 or later.
Smear
A phenomenon specific to CCDs whereby white streaks appear on the image when there is a very strong light source, such as
the sun or reflected sunlight, in the photography screen.
White Balance
Whatever the kind of the light, the human eye adapts to it so that a white object still looks white. On the other hand, devices
such as digital cameras see a white subject as white by first adjusting the color balance to suit the color of the ambient light
around the subject. This adjustment is called matching the white balance.
Exif Print Format is a newly revised digital camera file format that contains a variety of shooting information for optimal printing.