Rosco Cinegel · Colour Correction
Colour Correction Filters
Match any light source to daylight or tungsten with Rosco Cinegel CTB and CTO filters. Use the calculator below to work out the exact filter you need, then add it straight to your cart.
How colour correction works
Every light source has a colour temperature, measured in Kelvin (K). Warm sources like tungsten and candlelight sit low on the scale; daylight and blue sky sit high. When you mix sources — say tungsten fixtures against a daylight window — the eye and the camera see a colour cast. Correction filters shift one source to match the other.
CTB — cools light (adds blue)
Colour Temperature Blue raises the apparent colour temperature. Put CTB on a tungsten fixture (3200K) and it reads as daylight (5500K), so it matches a window or HMI. Available from 1/8 up to Double Blue.
CTO — warms light (adds orange)
Colour Temperature Orange lowers the apparent colour temperature. Put CTO on a daylight source and it reads as tungsten, so it matches practicals and interiors. Available from 1/8 up to Double CTO.
Mireds — the unit of shift
Each filter is rated by its mired shift. Negative shifts cool (blue); positive shifts warm (orange). The calculator works out the shift you need and matches it to the closest Cinegel filter.
Mired shift = 1,000,000 ÷ target K − 1,000,000 ÷ source K. All Cinegel correction filters are supplied as 20″ × 24″ sheets or full rolls.
Filter calculator
Tell us the light you have and the light you want to match. We will recommend the closest Cinegel filter and let you add it to your cart.
Choose a source and target to see the recommended filter.
The full correction range
Every strength in the Cinegel CTB and CTO ladders, with its rated mired shift. Click any filter to view sizes and buy.
CTB · Blue (cool the light)
Raise colour temperature — make warm sources read as daylight.
CTO · Orange (warm the light)
Lower colour temperature — make daylight sources read as tungsten.
Outdoor & UV protection add-ons
For fixtures used outdoors or in permanent installs, add a Cinegel UV filter to block ultraviolet and protect gels, lenses and artwork from fading. These pair with any correction filter above.
Not sure which filter you need?
As the exclusive Rosco distributor for Australia & New Zealand, we are happy to talk through your rig and get the match right.