Neutral Density

One final word on gels: if you are using CTO or CTS on windows, you will probably still need a neutral-density filter to decrease the level of light coming through the window. Outdoor light is much brighter than indoor light, and the neutral-density gel reduces the light coming in without changing the color temperature of the light. Conveniently, gel manufacturers have combined the CTO and CTS gels with neutral-density gels, so that you can actually use one gel to accomplish both color correction and light intensity reduction. Your windows will look like they have a brown glaze, but the camera will see only the beautiful green grass and blue skies that lie beyond the windows.

Contributing editor Robert G. Nulph, Ph.D., is an independent video/film producer/director and teaches video production courses at the college level.

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