Using this effect, you can change the brightness, intensity and
contrast of one or several images at once. Use the sliders to
customize each setting. The range of change is from
-100 % to +100 %. Clicking on the text Brightness,
Intensity and Contrast re-sets the corresponding values to zero.
The effect can be applied both to the entire image and to any part.
The effect is applied to the image as you move the slider and
you can see the effect in the
edit area and panel of properties
of the object. Press Apply button to make your changes permanent.