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The continuous-tone check exempts a neutral or single-curve picture when sixteen colors leave at most a fifth of the error of eight. The exemption is for flat art of up to sixteen clean levels, where sixteen colors leave no error. A gray photo with 0 to 2 levels of noise measures 0.19, under the cutoff, so it was classed as flat art and traced without smoothing, while its color original and the same photo with more noise were smoothed. The cutoff is now a tenth (VectorCraft's own value). Clean gray, sepia, single-hue and duotone art of up to sixteen levels stays flat art. Docs: docs/target-app-parity.md.