Nvidia PiD 4K Image Upscaler Workflow (Z-Image, Flux.1, Flux.2, SD3 compatible) by Smittie

Smittie's PiD Upscaler Workflow

Description

With this workflow you can upscale low-resolution images (512, 1K) to much higher resolutions (2K, 4K) using Nvidia's PiD (Pixel Diffusion). It is a simple image to image (I2I) workflow.

Install Instructions

1. Update ComfyUI to latest build with PiD support

2. Install all missing custom nodes via the ComfyUI Manager

3. Download all needed models

Diffusion model

• All available

• For Z-Image or Flux.1 like images in 1K resolution use pid_flux1_1024_to_4096_4step_bf16.safetensors

Text encoder

• gemma_2_2b_it_elm_bf16.safetensors

VAE

• ae.safetensors

Video Instructions

If you don't know what to do, you can watch the Nvidia PiD Tutorial by AI Search. He works with a different workflow, which I have built upon.

Acknowledgement

Most credits goes to the Nvidia, ComfyUI and CivitAI team, as well as kijai and AI Search. Thank you guys!