FujiFilm FN-PS551 Service Manual page 417

Appendix Chapter 2. Service Utility-Additional Instructions
Contrast Adjustment
Adjust the inclination (rise) of the reference gamma curve by varying the contrast parameter value. The
gamma curve is increased of decreased in the input QL direction according to the value of contrast.
Contrast is equal to the inclination of the tone curve multiplied by 100; in the chart illustrated below, it is
represented by a ratio of L1 to L2 (L1/L2 × 100). Its input range is from 10 to 400. With contrast = 100,
the gamma curve is equal to the reference gamma curve. The inclination of the gamma curve is gradual
with contrast < 100, whereas it is sharp with contrast > 100.
Output QL
0
Contrast Adjustment (BAR Scheme)
Combination of Density and Contrast Adjustments
Adjust and vary the gamma curve in combination of density and contrast adjustments.
Output QL
0
Combination of Density and Contrast Adjustments (BAR Scheme)
006-251-00
10.30.98 FM2327
Reference gamma curve
contrast<100
contrast>100
L2
L1
FP4G0203.EPS
Reference gamma curve
Input QL
Gamma curve based only
on density adjustment
Gamma curve after both density
and contrast adjustments
Input QL
FP4G0204.EPS
FN-PS551 Service Manual
Appendix-20
Appendix-20