With the Colour toolbar you can edit some properties of the selected object.
To open the Colour toolbar, click the Colour icon on the Image toolbar.
Specifies the proportion of red RGB colour components for the selected graphic object. Values from -100% (no red) to +100% (full red) are possible.
Red
Specifies the proportion of green RGB colour components for the selected graphic object. Values from -100% (no green) to +100% (full green) are possible.
Green
Specifies the proportion of blue RGB colour components for the selected graphic. Values from -100% (no blue) to +100% (full blue) are possible.
Blue
Specifies the brightness for the selected graphic object. Values from -100% (only black) to +100% (only white) are possible.
Brightness
Specifies the contrast for viewing the selected graphic image. Values from -100% (no contrast at all) to +100% (full contrast) are possible.
Contrast
Specifies the gamma value for the view of the selected object, which affects the brightness of the midtone values. Values from 0.10 (minimum Gamma) to 10 (maximum Gamma) are possible.
Gamma