SECTION 17: Getting Label Print Job Started
48
3 Correcting
Colors
Each P-55 unit has its own tone characteristic (or gamma characteristic). Because of that, differences in
print quality, especially in tone, can be produced when the same image is printed on more than one P-55.
To compensate for such differences, the P-55 offers the function of color balance or gamma correction.
If you use more than one P-55, minimizing differences across units using the function is recommended.
-The following “gamma characteristic” curves show how input images can be output by the P-55.
*Color depth is represented in a scale of values ranging from 0 to 255.
*The closer the value is to 0 the whiter the color is, and the closer the value is to 255 the blacker the
color is.
-Fig.1 shows the curve with reference values for gamma characteristic (1.00 for gamma, 0% for gain).
-Fig.2 shows the curve with a gamma deviation of 1.15 and a gain deviation of +8%.
*If you print using the printer with the settings shown in Fig.2, the reference color and the sample color
blend together best in the area where the gamma -0.15 and the gain -8% are shown on the disc.
-Fig.3 shows the gain-corrected curve where the highlight tonal range has been adjusted. *Note1
-Fig.4 shows the gamma-corrected curve where the shadow tonal range has been adjusted. *Note1
*Note1: These curves are just images and not intended to suggest that color correction always makes input
and output images match as shown in Fig.1. Color correction minimizes differences in print quality
across units.
0
51
102
153
204
255
0
51
102
153
204
255
Input
(%)
Present value
Gamma value
Gamma characteristic curve
Ou
tpu
t
Fig. 2
Gamma characteristic curve
0
51
102
153
204
255
0
51
102
153
204
255
Input
(%)
Ou
tpu
t
Present value
Gamma value
Fig. 1
0
51
102
153
204
255
0
51
102
153
204
255
Input
(%)
Present value
Gamma value
Gamma characteristic curve
Ou
tpu
t
Fig. 3
0
51
102
153
204
255
0
51
102
153
204
255
Input
(%)
Present value
Gamma value
Gamma characteristic curve
Ou
tpu
t
Fig. 4
