Now, certain Canon G9 systems will handle this differently, but you can often find this control within the light properties. Some Canon G9 Cameras require you to use a spotlight for the effect. http://www.canong9.net/spectral_composition.html http://www.canong9.net/correct_an_image.html http://www.canong9.net/color_images_histograms.html http://www.canong9.net/post-capture_correction.html http://www.canong9.net/fluorescent_light.html http://www.canong9.net/light_balancing.html http://www.canong9.net/SED_curve.html http://www.canong9.net/selecting_a_point.html http://www.canong9.net/curves_and_color_balance.html http://www.canong9.net/shift_and_stretch.html