GelMate

GelMate answers the question you ask on set twice an hour: what gel do I put on this light to make it match that one. Type the colour temperature you are starting from and the one you need. GelMate gives you the shift in mireds and the correction gel that produces it, either a single gel or the closest two-gel stack, with the leftover error in mireds so you know exactly how close the match is. WHAT YOU CAN DO - Work out the mired shift between any two colour temperatures, in either direction. - Get the closest single correction gel for that shift, from full, half, quarter and eighth strength CTO and CTB. - Get the closest two-gel stack when no single gel is close enough, searched across every combination of the eight strengths. - See how far off the match is, in mireds, so you can decide whether it is close enough for the shot. - Read both temperatures converted to mireds side by side, which is the scale gels actually work on. - Jump to thirteen common sources with one tap: candle, sodium vapour, tungsten, warm and cool fluorescent, halogen, sunrise and sunset, LED neutral, daylight, LED daylight, overcast, shade and clear blue sky. - Work in dark or light, following whatever your phone is set to. WHY MIREDS Kelvin is not linear. Two hundred Kelvin at the warm end is a visible shift and two hundred Kelvin at the daylight end is almost nothing, which is why a gel cannot be rated in Kelvin. Gels are rated as a mired shift, a fixed move that behaves the same wherever you apply it, and that is the number GelMate works in. WHO IT IS FOR Gaffers and lighting technicians on set, camera operators mixing tungsten fixtures with daylight through a window, photographers gelling a flash to match ambient light, and film students learning why the same gel does two different things on two different lamps. PRIVACY GelMate makes no network requests. There is no account, no sign up, no analytics and no advertising. It works with no signal at all, which is the point on a location set. GelMate uses the standard published mired values for CTO and CTB correction gels. Real gels vary batch to batch, and mixed or aged sources vary more, so treat the result as a starting point and trust your eye and your meter.