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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, but only applied the exemption below the 0.1 ratio. Clean gray, sepia, single-hue and duotone art of 10 to 16 evenly spaced levels lands above it, so it was smoothed before tracing. The exemption now applies in both branches. At 16 Colors, 12 sepia and 16 gray or sepia levels crossed by 1 px lines keep every region the lines cut, and Automatic traces 16 clean sepia levels in 9 colors instead of 4. Art in several unrelated colors is unaffected.