Overview
This procedure shows how to adjust the printer gamma by SP mode manually after the ACC (Automatic Color Calibration) has been performed. Adjustment should be performed only in the ‘Offset’ part of the screen, and not in the ‘Option’ part of the screen. Adjustable modes are "Text mode", "Photo mode", "B&W text mode" and "B&W photo mode".
- Perform ACC in copier mode with User Tools.
- Take a copy of a C-4 test chart in the mode which you need to adjust.
- Enter Copier SP mode.
- Select SP4918-009 (Man Gamma Adj) and press "CHANGE"
- If you touch the "Change" button, the following 3 screens will be displayed. These screens can be changed by pressing the "Next" or "Previous" button.
- Press the "Copy Window" button on the bottom left, then take a copy of the C-4 test chart. Then compare the gradation patch pattern on the copied image and the C-4 test chart.
Step | Output ID | C-4 chart level | Adjustment Reference | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | ID max (K/C/M/Y) | Adjust the 'Offset' value so that the density of level 10 in the gradation patch pattern on the copy becomes the same as level 10 on the C-4 chart. | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
2 | Middle (K/C/M/Y) | Adjust the 'Offset' value so that the density of level 6 in the gradation patch pattern on the copy becomes the same as level 10 on the C-4 chart. | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
3 | Shadow (K/C/M/Y) | Adjust the 'Offset' value so that the density of level 8 in the gradation patch pattern on the copy becomes the same as level 10 on the C-4 chart. | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
4 | Highlight (K/C/M/Y) | Adjust the 'Offset' value so that dirty background is not visible on the copy and the density of level 3 is slightly lighter that of level 3 on the C-4 chart. | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||
5 | K Highlight (K/C/M/Y) | Adjust the 'Offset' value so that black scale levels 3 through 5 in the copy are seen as gray (no C, M, or Y should be visible). If the black scale contains C, M, or Y, redo step 1 to 4. - Only in Photo mode - | ||||||||||
1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | |||