Fujitsu fi-4990C manual Drop-out Color, Print density measurement, Drop-out color standards

Drop-out Color

A drop-out color is a color visible by a human eye but not visible to the scanner.

To check the grounding color of document for a drop-out color, use the method and follow the standards given below.

Print density measurement

The spectrum chart shown in Figure 4.4 is used to measure print density.

The measurement must be made in one of the following ways:

•A light source using fluorescent.

•Macbeth PCS meter PCM II is used, which requires a filter.

Relative Spectral Power

100

90

80

70

60

50

40

30

20

10

0	500	600	700
400

Waveength (nm)

Figure 4.4 Spectrum band

Drop-out color standards

In the spectrum of fluorescent lamp the PCS value must satisfy the following standards:

•Maximum: 0.14 or less

•Average: 0.1 or less

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