Fill Blur Strength

Sets the blur strength of the background fill when fit=fill (or fit=fillmax) is used with fill=blur.

fill-blur accepts an integer from 0 to 2000. The value maps to a Gaussian sigma of fill-blur ÷ 10 (so fill-blur=300 ≈ σ 30). The default is 0, which means auto — Imgix computes a blur strength of min(width, height) / 20 (clamped to 4–200), producing a well-scaled defocus that looks polished without extra configuration.

fill-blur only takes effect with fill=blur. It is ignored for fill=solid and other fit modes.