Cinematography-Theory-And-Practice

Conversion GelsConversion gels convert daylight to tungsten or tungsten to daylightbalance. They are by far the most commonly used color gels in filmand video production. They are an essential part of any gel packageyou bring on a production.although they can range much higher. Near sunrise and sunset theyare much warmer because the sun is traveling through a much thickerlayer of atmosphere and more of the blue wavelengths are filteredout. The amount of dust and humidity in the air are also factors,which accounts for the different colorings of sun and sky prevalentat various times of the day, in different locales, in different weatherconditions, and even at different altitudes.CTOCorrection to match tungsten balance is achieved with either 85(camera filter) or CTO (a lighting gel), both of which are orangefilters. They have essentially the same effect; the reason they havedifferent names is due to the history of their development: 85 is aWratten number, which is a system developed by Kodak for filters.CTO is the acronym for Color Temperature Orange. This means thatit will convert 6500K to 3200K, which is excellent when correct--An important variation of CTO is the combination of color correc-The Basic Gel FamiliesFigure 12.20. Extreme use of coloris particularly justified in dream orfantasy sequences, such as this onefrom The Fall.85 Conversion Used to Convert Daylight to Tungsten80 Conversion Used to Convert Tungsten to Daylight82 Light Balancing Used to Slightly Cooling the Light81 Light Balancing Used to Slightly Warm the LightTable 12.2. The basic filter familiesare conversion filters that converttungsten to daylight or vice versaand light balancing filters, used towarm or cool the light source.color239