Oce OP30C Operation Manual page 46

[Example 1]
If you select "Yellow - Blue" ["Y-B"] and then select a minus value,
greens near yellow will be intensified towards yellow and magentas
near blue towards blue. (See sample 1 on page iii.)
[Example 2]
If you select "Yellow - Blue" ["Y-B"] and then select a plus value, reds
near yellow will be intensified towards yellow and cyans near blue
towards blue. (See sample 2 on page iii.)
6 Press the Enter key.
7 Use the M cursor key to select "z End" and then press the
Enter key. The message display will return to the "Ready to
copy." screen.
Section 5 COLOR COPY SETTINGS
5-6