Canon BJC 3000 Reference Manual page 314

Adjusting Brightness (gamma curve coefficient)
In the printer driver, you can specifies the contrast among intermediate
tones between black and white. For example, adjusting the brightness
towards Light makes the overall image brighter, with stronger contrast in
the light areas and lower contrast in the dark areas.
To adjust the brightness, follow the procedure below.
Windows
1
Open the Printer Properties dialogue box, and click the Advanced button in
the Main tab.
2
Click the Colour tab.
3
Specify the desired brightness setting in the Brightness box.
Note
If Brightness is greyed out and cannot be used, check Colour Adjustment in
the checkbox.
Troubleshooting - Avoiding Problems 314