Testing MiniMax H3 Low-Denoise V2V Upscaling: Smearing Issues Persist
Randalix · reddit · 2026-08-12
The author attempted to use MiniMax H3 as a cheap img2img-style upscaler by encoding an existing clip at a higher resolution and applying a low-denoise resample.
After writing a custom 15-line node to handle the NestedTensor latent required by H3's sampler, they tested upscaling a 960x512 clip to 1280x704. However, both denoise settings (0.4 and 0.55) resulted in severe smearing across the entire frame, likely due to RoPE resolution mismatch.
The author ultimately fell back to SeedVR2 and RTX VSR, which handled the clip cleanly, concluding that dedicated upscalers remain the correct tool for this task.
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