Guide
Premiere Pro Green Screen Removal
Short answer: in Premiere the keyer is not the hard part. Ultra Key has three sliders and they work. What decides whether the shot looks right is the order of the effect stack around it: a garbage matte before the key, the key before the grade, and the frame test before any of it. Change that order and the same slider values produce a different result, because the key always evaluates whatever pixels reach it — not the original ones.
The stack that works
| Order | What you apply | Why it has to be here |
|---|---|---|
| 1 | Mask or crop off what should never be keyed: lights, floor, a stray stand | Fewer pixels for the key to judge, and no chance of punching holes where the screen is not |
| 2 | Ultra Key, with the screen sampled from a flat area | The matte is built from the pixels that reach the effect at this point in the stack |
| 3 | Colour correction, then the new background | The matte is already fixed, so grading changes the subject without silently changing what was keyed |
Why grading before the key is a different shot
Ultra Key does not know what the screen looked like on set. It only sees the values that arrive at its position in the stack. Move a grade above it and you are keying the graded colour — which can be useful, because lifting the screen toward a single value makes an unevenly lit backdrop easier to key. It also means the matte now depends on the grade, so every later adjustment to the grade is also an adjustment to the key.
None of that is wrong. It just has to be a decision rather than an accident. The common failure is a stack where the grade sits above the key for one clip and below it for the next, and the two clips no longer cut together because their edges were built from different pixels.
Test one frame before you tune a clip
Scrub to the hardest moment in the shot — the fastest movement, the closest approach, the least lit corner — and export that frame as a PNG. Tune on that single still until the edge and the spill are right. Then go back to the timeline and apply the same numbers.
Working on a still removes the variable that makes video tuning so slow: the frames keep changing while you adjust. A browser-based single-image remover is a convenient bench for exactly this step, because it shows one frame and nothing else. Open the green screen remover if you want that bench; the numbers transfer to Ultra Key even though the tools are unrelated.
The settings that actually change the result
- Sample point. Pick a flat, evenly lit patch of screen, not a highlight and not the shadow beside the subject. This one choice moves the result more than any slider.
- Matte generation. The transparency and pedestal pair decide how much of the edge becomes partly transparent. Set them on the hardest frame, not the first one.
- Spill suppression. It removes green bounced onto the subject. Do it before you grade, or the grade will amplify what is left.
- Matte cleanup. Small holes and stray pixels; use it after the main key is right, not instead of getting the key right.
Where this site fits, honestly
This is not a Premiere plugin and it does not open project files. It is a browser tool that keys a single still image and writes a PNG with transparency. Its role in a Premiere workflow is the frame test above: export a still, find the numbers that work, then apply them in Ultra Key.
What it cannot do is anything that depends on the timeline — tracking, per-frame stabilisation, or the interaction between the key and later effects. Those live in the editor. This page covers the frame-first method in more detail.
Questions
Which effect removes a green screen in Premiere Pro?
Ultra Key is the built-in keyer most people use: sample the screen colour, then adjust matte generation and cleanup. A garbage matte before it and colour correction after it complete the job.
Should the colour grade go before or after Ultra Key?
Usually after. The key is then built from the original pixels and the grade changes the subject without changing the matte. Putting the grade first can help an uneven screen, but it makes the key depend on the grade.
Why does the key look different after I add a look?
Because the look is applied to the composite, so it changes the edge as well as the subject. A look that lifts shadows can make a leftover fringe visible; a look that crushes blacks can hide it. Judge the edge with the grade on.
Can I use a browser tool to find the settings first?
Yes, as a frame test. Export the hardest frame, tune on that single image, note the tolerance and softness, then apply equivalent values in Ultra Key. It does not save the settings for you.
Why is there still a green edge after keying?
Either the edge pixels are a blend of subject and screen that the matte has kept, or spill is still on the subject. Fix the matte first, then suppress spill; raising the key strength instead will eat the subject.
Does this site work inside Premiere?
No. It runs in a browser and processes one still image at a time. It is a testing bench for a frame, not a timeline effect.
Does this site upload the frame I test?
No. The removal happens in your browser and the image stays on your machine.
Related: why one frame is the unit for video, and what changes when there is no screen to key.
Open the green screen remover — free, no account, and it writes a PNG with a real empty background at the size you loaded. Use it to find the numbers on one hard frame, then take them into your timeline.