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Rosco CTB Blue overview. Roscoe Full Blue CTB Color Conversion Gel Filter - This filter is traditionally used to convert tungsten lighting to daylight. CTB (Color Temperature Blue) filters are available in a full spectrum of degrees (strengths) which, depending on your needs, can be used to either raise the temperature of your lighting or to create different lighting interpretations. CTB filters offer you complete control when shooting under tungsten lighting.
determine the amount of light absorbed by the sample (or the intensity of light transmitted through the. sample). light source is usually a tungsten lamp for the visible region of the spectrum, and either a. hydrogen or deuterium lamp for ultraviolet wavelengths.