Remove green or blue screen backgrounds with adjustable tolerance and spill suppression.
Green Screen Keyer isolates a foreground subject from a photographed green or blue backdrop. Select the screen color, then adjust tolerance until the background becomes transparent while the subject remains opaque. Spill suppression reduces the colored cast that reflected screen light can leave around hair, clothing, and other edges. The common surprise is that the two controls solve different problems: tolerance decides what is removed, while spill suppression changes unwanted edge color. Raising tolerance to cure a green fringe can instead cut holes in the subject, especially where it contains colors close to the chosen key.
The green or blue setting identifies the backdrop color to key. Tolerance controls how far other pixel colors may depart from that key and still be treated as background. A narrow setting preserves more of the subject but may leave screen patches. A broad setting removes varied screen tones but may also remove similarly colored subject areas.
Spill suppression addresses green or blue light reflected onto the foreground, most visibly along semi-transparent hair, soft edges, and shiny objects. It reduces the key-colored cast in retained areas; it is not a second background-removal threshold. Strong suppression can make edges gray or shift genuine green or blue details, so evaluate the subject as well as the backdrop.
The shirt is probably close enough to the selected key color to fall inside the current tolerance. Lower tolerance and check whether the screen remains acceptably removed. If the subject and backdrop genuinely share the same color, a global chroma key cannot reliably distinguish them; a different source image, a local mask, or manual editing is needed.
No. Spill suppression is for unwanted green or blue coloration on pixels that remain in the foreground. Ragged edges, holes, and surviving background patches are mask problems, so adjust tolerance first. If the screen is uneven or the edge combines subject and backdrop colors, no single setting may produce both a clean background and a fully preserved subject.
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