OptionaledgeOptionaledgeAbsolute minimum luma contrast before any work is done — skips near-flat regions. 0.0312–0.0833 typical. Default 0.0312 (FXAA "high").
OptionalsubpixelSub-pixel aliasing removal amount, 0..1. 0 disables sub-pixel softening (sharper, more crawling); 1 = full. Default 0.75.
Relative contrast required to treat a pixel as an edge (range vs. rangeMax). Lower = more edges caught (softer, more cost). 0.063–0.333 typical. Default 0.166 (FXAA's "default" quality).