Glossary
Appendixes
118
Noise
Misinterpreted pixels in a digital image that may appear as misplaced or random,
bright pixels. Noise usually occurs when photos are shot with a high sensitivity or
when a sensitivity is automatically set in a dark place.
Optical zoom
This is a general zoom which can enlarge images with a lens and does not degrade
the quality of images.
Quality
An expression of the rate of compression used in a digital image. Higher quality
images have a lower rate of compression, which usually results in a larger file size.
Resolution
The number of pixels present in a digital image. High resolution images contain
more pixels and typically show more detail than low resolution images.
JPEG (Joint Photographic Experts Group)
A lossy method of compression for digital images. JPEG images are compressed to
reduce their overall file size with minimal deterioration of the image resolution.
LCD (Liquid Crystal Display)
A visual display commonly used in consumer electronics. This display needs a
separate backlight, such as CCFL or LED, to reproduce colors.
Macro
This feature allows you to capture close-up photos of very small objects. When
using the macro feature, the camera can maintain a sharp focus on small objects at
a near life-size ratio (1:1).
Metering
The metering refers to the way in which the camera measures the quantity of light
to set the exposure.
MJPEG (Motion JPEG)
A video format which is compressed as a JPEG image.
