Color - Negative Stain
Negative Stain is an artifact that appears as the inverse of an expected on-screen appearance.
Similar to a pixel error, appearance is typically unintended and can act as a distraction pulling attention away from the focus of the program.
Major artifact across single frame or minor artifact across multiple frames, overlaps onscreen character or object of focus.
How to Prevent:
Negative stains are most commonly introduced on the DI, especially when grain is added to the image for a "film look."
Remove the artifact from the image, likely introduced by an external effect on the image, may only require a re-render of the DPX frame to remove. VFX may be necessary if experienced in-camera.