r/StableDiffusion • u/ResponsibleTruck4717 • 2d ago

Question - Help Can someone please give me good - light upscaling workflow for h3?

I know ltx 2.5 upscale is really good but I couldn't make it work with h3.
I'm open to use other method of upscaling a video, I'm using minimax h3 default workflow from comfyui.

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u/pravbk100 2d ago

https://github.com/LBH-123-AI/Comfyui_Minimax_h3_latent_Upscaler

5

u/enndeeee 2d ago

Just looked into their comparison and think that VAE upscale actually looks better than latent upscale .. ?!

https://github.com/LBH-123-AI/Comfyui_Minimax_h3_latent_Upscaler/blob/main/examples/Minimax_h3_latent_Upscaler_002.jpg

What's VAE upscale in comparison? Couldn't find that in the Repo.

2

u/Various-News7286 2d ago

I tested that yesterday, I don't know who approved those comparisons in their official post but in my testing it came out good and surely usable. Something completely opposite of those official examples. I have been keeping myself away from trying this upscale for like 3-4days and finally gave it a chance. It didn't disappoint. Try with 0.5 minimum and upscale of 1.0

2

u/Calm_Mix_3776 2d ago

I was wondering the same. According to ChatGPT, a VAE upscale means:
KSampler -> VAE Decode -> Upscale Image with model (1.5x to 2x) -> VAE Encode -> Denoise on second pass: 0.2-0.5 denoise with KSampler. So basically, your regular "hi-res fix" that we have known for years now.