Even green screen lighting comes from treating the background and the subject as two different jobs. Put two soft lights on the cloth and a separate key light on the person, then set each pair on its own control. When you manage both sides by hand, an even wash across the cloth stops being a guessing game.
Aim the screen lights from about forty-five degrees off each side and point them across the fabric, not straight at it. Crossing the beams fills the middle and keeps the edges from going dark. If you light the screen head on, the center cooks while the corners fall into shadow.
Set the two screen lights to the same power and meter the corners, not just the middle. A cheap light meter app on a phone is enough for this. You want the reading to change by less than half a stop from one side to the other.
Move a light closer or farther to even things out instead of nudging a dimmer every time. Distance gives you a smooth change, while a dimmer can shift the color of some bulbs. Check the corners again after any move, because the center will change too.
Your key light should fall on the person and stop before it hits the cloth. Barn doors, a flag, or a simple card can shape the beam and keep it where it belongs. If the key spills onto the background, one side of the screen gets brighter than the other and the key fights you.
Watch the shadow. A subject lit too close to the screen throws their own shape onto the cloth, and no amount of keying will remove a green shadow with a soft edge. Back the person away and the shadow disappears.
Even lighting is a metering habit, not a piece of expensive gear.
Window light changes through the day and sneaks color onto everything it touches. Close the blinds or shoot at night so the only light in the frame is the light you set. A flicker in the green from a passing cloud is nearly impossible to fix later.
Turn off overheads that spill onto the cloth from above. Fluorescent tubes also pulse at a rate some cameras catch, which shows up as a gentle wave across the green. A dark room that you light yourself is the calmest place to key.
Screen lights and subject lights should match or the green shifts from one side to the other. Mixing a warm bulb with a cool one shows up as a color drift that the key reads as two different greens. Set every light to the same temperature before you touch anything else.
White balance the camera on the lit screen, then look at your skin tone under the key. If the face runs too warm or too cool, fix the subject light, not the camera menu. Both jobs can share one color temperature once you plan for it.
Setting up your first green screen takes a frame, a cloth, and some patience. Here is the order that keeps wrinkles and hot spots out of your shot.
Distance keeps a green screen key clean. Stand your subject several feet from the cloth so shadows and color bounce never touch the shot at all.
The right clothes for a green screen shoot come down to one rule: avoid the screen color. Solid matte fabric and tidy edges keep the key clean.
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