Exposure; Types Of Densitometers - AGFA SelectSet Avantra Series Operating Manual

3–12 SelectSet Avantra Series Control Panel and Operating Guide

Exposure

Exposure is the amount of light that reaches the media. As you
increase the exposure value, you increase the amount of light that
reaches the media to create an image.
Exposure affects density as follows:
Underexposure
The exposure setting is too low; there is not enough light. The
Dmax is too low; black areas appear gray.
Overexposure
The exposure setting is too high; there is too much light. The
Dmax is too high; fine screens will fill in, making tone reproduc-
tion inaccurate.
Optimum Exposure
The exposure setting is correct. The Dmax is within the correct
range.

Types of Densitometers

Transmission Densitometer
Measures how much light passes through processed film. Use for
evaluating film.
Reflection Densitometer
Measures how much light is reflected by an opaque image. Use for
evaluating photographic paper, plate material, or press print.