Q. Can I directly adjust the tone curve to change the brightness or contrast?

A. Yes, you can.

Select the Adjust Each Color tab on the Tone Curve Adjustment screen, and add a handle (operation point) to the tone curve; you can directly adjust the tone curve.

For details, refer to Adjusting the tone curve with Color Centro.

For details about how to apply the created tone curve, refer to Tone curve setting from printer driver.