Vignetting
Category: Capture
Darkening towards the image edges and corners, caused by lens or aperture. Especially troublesome in stitching, as it creates visible brightness patterns.
Vignetting denotes the fall-off in brightness from the image centre to the edges. Causes are optical and structural properties of the lens as well as the aperture; the effect is usually strongest at open aperture.
In gigapixel stitching vignetting is critical: left uncorrected, it produces a grid-like brightness pattern at the tile boundaries of the composite. It is therefore compensated before stitching.
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