CTO and CTB gels

What are CTO and CTB gels? What are they used for? What are two practical or artistic uses for these in your films?

CTO is considered Tungsten and is often associated with an orange undertone. CTB is known as daylight and is associated with a blue undertone. Gels can change the color temperature of a certain light. For example, if two lights unintentionally have different color temperatures, these gels can be clipped in front of the light to match the color. These two different color temperature gels can be used to intentionally create a mismatching color temperatures. For example, a CTO gel can be placed in front of the subject while a CTB gel is used to create a colder background.