Problem
A blue wardrobe item is used against a blue screen, causing key spill and subject transparency in similarly colored regions.
Solution
Root Cause / Diagnostic:
Wardrobe hues sharing cyan or blue wavelengths overlap with the targeted blue backing color space in the compositing engine. The keying algorithm treats both the background and the garment as transparent backing, hollowing out the subject's outfit.
Actionable Fix:
1. Replace blue wardrobe with warm, contrasting tones (earth tones, reds, warm yellows, or neutral grays) that reside 180 degrees away on the vectorscope.
2. If the blue garment is mandatory, switch the backdrop to a chroma green cyclorama and relight accordingly.
3. Check the composite matte view to confirm the clothing zone remains 100% opaque black in the garbage matte inspection channel.
Pro Tip:
Always enforce a pre-shoot wardrobe lookbook: forbid green garments on green screens, blue garments on blue screens, and high-sheen satin textures on both.
Wardrobe hues sharing cyan or blue wavelengths overlap with the targeted blue backing color space in the compositing engine. The keying algorithm treats both the background and the garment as transparent backing, hollowing out the subject's outfit.
Actionable Fix:
1. Replace blue wardrobe with warm, contrasting tones (earth tones, reds, warm yellows, or neutral grays) that reside 180 degrees away on the vectorscope.
2. If the blue garment is mandatory, switch the backdrop to a chroma green cyclorama and relight accordingly.
3. Check the composite matte view to confirm the clothing zone remains 100% opaque black in the garbage matte inspection channel.
Pro Tip:
Always enforce a pre-shoot wardrobe lookbook: forbid green garments on green screens, blue garments on blue screens, and high-sheen satin textures on both.