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For 4x cartoon upscaling with clean line art and flat colors, use optical-flow-guided temporal consistency; style loss hallucinates texture. Independent technical note mirroring the canonical version: https://aivideoupscale.com/blog/upscale-animated-cartoons-optical-flow-guided-consistency-for-4x-vs-style-loss.php Sources consulted: https://www.bluusun.com/
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