Konica Minolta bizhub PRESS C8000e - Manual (Page 405)

bizhub PRESS C8000/e 9-87
9.12 [05 Color Density Control] 9
9.12 [05 Color Density Control]
The gamma correction is usually operated by an IDC sensor internally mounted on the machine. This machine
also offers the method using a density sensor attached to Relay Unit RU-508 to scan charts output for the
gamma correction. In this method, the gamma correction can properly reflect the status of the 2nd transfer
unit and fusing unit, and also the characteristics of paper, as the sensor scans the images actually output for
the correction.
The gamma correction using the sensor of Relay Unit RU-508 provides the two methods: automatic adjust-
ment and manual adjustment.
The gamma correction requires the colorimetric data to be the base of correction, in addition to the scanned
charts to be compared with them.
The following two types of colorimetric data are provided:
- Colorimetric data provided as factory default
- Custom colorimetric data measured with the desired paper and screen types
The custom colorimetric data should be precomposed using the Spectrophotometer i1iSis XL and registered
into the machine by creating a paper category.
This section describes how to select the gamma correction sensor, to make automatic/manual adjustment
using the sensor of Relay Unit RU-508, and to create the paper category.
Select the colorimetric data to be the base of correction while making the paper setting for each tray.
9.12.1 [01 Color Density Control]
Select either an internal IDC sensor or the density sensor attached to Relay Unit RU-508 for the gamma cor-
rection.
- While operating the color density control, the machine outputs several sheets of chart to be scanned
with the density sensor of Relay Unit RU-508. In automatic adjustment, the charts will be delivered to
the secondary (sub) tray in order to separate them from normal output jobs. In manual adjustment, they
will be delivered to the tray selected in the Output Setting.
- The number of output sheets varies depending on the paper size.
d
Reference
For the definitions of width (Y) and length (X), see page 1-6.
The number of sheets output as charts are included in the print count.
If you use the density sensor attached to Relay Unit RU-508 for the gamma correction (referred to as the
color density control hereafter), select either automatic or manual mode to operate it.
For the automatic adjustment, the following settings are required:
- Adjustment level: Specify the level of the change between before and after the adjustment.
- Adjustment interval: Set the timing for the adjustment.
- Adjustment While Job Running: Specify whether to wait for completion of a job or to make the adjust-
ment during a job in progress, when the output count specified as [Adjustment Interval] is reached.
- Link to Quality Adjustment: Specify whether or not to automatically operate the color density control
after [Gamma Correction] functions when specified from [02/03 Administrator Setting] - [01 System Set-
ting] - [04/05 Expert Adjustment] - [04/07 Quality Adjustment] - [02/04 Stabilization Adj. Setting] on the
Utility Menu Screen.
NOTICE
The color density control may be necessary because the gamma correction of the IDC sensor specified from
the above [02/04 Stabilization Adj. Setting] is supposed to function due to the change of machine status or
process status.
Group Details Output sheet
count
Large sizes Paper sizes of 271.0 mm or more in width (Y) 3 sheets
Medium sizes Paper sizes of 210 mm to 270.9 mm in width (Y) 4 sheets
Small sizes Paper sizes of 176 mm to 209.9 mm in width (Y) 6 sheets
Irregular siz-
es Paper sizes of 175.9 mm or less in width (Y), 168 mm or less in length
(X) Not corrected
as being exempt