![]() These are some LED fixtures for office ceiling lighting that I changed the LED strips for High CRI LED strips. I have a whole range of fairly posh lights available - but I still go back to my home made lights for lighting the screen. I start with the screen 1 stop under the subject. This is because everyone tells you their magic ratio, and of course they are right! #Greeen screen lights seriesWhen I get a new camera I do a quick series of tests changing the relative brightness of the screen to the subject. What really helped was realising that not all cameras behave the same. I would say that it took me a 20+ attempts to get green screen to the level I have it today. I can see creases in your example image - and that background is far from even! That lack of evenness will be you biggest headache.Ĭreases are easy to sort with a steam iron a few centimetres away. Then shoot in RAW or as close to RAW as you can get. The app even predicts how much quality I will get out of the Key. For me, the 'key' to getting a great key is to use a little app on your phone to check that that background lighting is even. So, subject 4m from the green screen makes this a really easy thing to do. ![]() The overhead-only rig requires about 50% more tubes and spills substantial green or green light onto the foreground in front of the screen. Lighting from above requires careful adjustment to achieve even illumination. The advantage of lighting from above is that the floor is clear of green lamps. A backing can be evenly lit entirely from above by placing a second row of lamps about 30% further away from the screen and below the top row. The goal is to eliminate direct green light falling on the actor. Keep the subjects at least 15 feet from the screen. The lamps must overlap the outer margins of the screen. The units may be separated by the length of the tubes, or brought together as needed to build brightness. (Please refer to screen lighting section.) If the backing itself is irregular in brightness, the background image seen “through” the irregularities will become equally irregular in the composite."Ī good scheme for front-lit backings is to place arrays of green fluorescents above and below the backing at a distance in front equal to approximately 1⁄2 the backing height. While a perfectly uniform backing is desirable, it may not be achievable in the real world. #Greeen screen lights plus"BACKING UNIFORMITY AND SCREEN CORRECTION Since the luminance level and saturation of the backing determines the level of the background scene, it is important to light the backing as uniformly as is practical, ideally within plus or minus 1⁄3 f-stop. "American Cinematographer Manual" by The ASC Press. With a screen size of 9'x10' you won't be able to out the talent 15ft away but the principle is the same. ![]() It's dated on technical details but useful info practically. They talk about Kinoflo banks but you can get similar cheaper florescent lighting banks. I remembered coming across some useful info in the ASC Manual, I'll post a bit here. ![]()
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