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After Effects weighs each of the four points by its inverse squared distance softened by Blend squared, 1 / (d^2 + Blend^2) in pixels: fitted to AE 2026 renders of the default gradient at Blend 10, 100 and 300 and case 904 E16 at Blend 50 (power 2.00 at every Blend, softening 0 / 2367 / 9817 / 90127 = about Blend^2; mean error 0.27/255, max 0.9). EffectCraft used 1 / (d^2 / (100 Blend))^1.5, in which Blend cancels out: E16 was 34/255 off on 99 % of the grid, now 0 grid points off, max 1/255, CPU and GPU. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>