You can adjust current selected objects' brightness and contrast by using Transform>Adjust Brightness/Contrast menu item or corresponding toolbar button.
Brightness |
Specifies the image's light intensity: Moving the slider to the right to lighten the image, while moving the slider to the left to darken it. |
Contrast |
Specifies the amount of difference between color and brightness in image:Moving the slider to the right to darken the shadowed areas in an image, while moving the slider to the left to brighten them. |