Ricoh KW5708, Service Training

Page: 54 / 61

Slide 54
Terms and Definitions - 7

Contrast

In general, this is the ratio between the bright and
dark parts of an image. A high contrast gives a
clear image. A projector with an internal light
source is unaffected by external light sources
gives a high contrast image that is clear.

Jitter, Flickering

Jitter is noise in the image that is mainly caused
by temporary fluctuations in the movement of
rotating components, such as the motors that
drive the heads in a VCR unit. The effects can be
seen on vertical lines in the image.

Flickering of the image also can occur.