P-H3-Image turns short prompts into 8MP images in eight steps.

Who it's for: creators who want this pipeline in ComfyUI without assembling nodes from scratch. Not for: one-click results with zero tuning - you still choose inputs, prompts, and settings.

Open preloaded workflow on RunComfy

Open preloaded workflow on RunComfy (browser)

Why RunComfy first
- Fewer missing-node surprises - run the graph in a managed environment before you mirror it locally.
- Quick GPU tryout - useful if your local VRAM or install time is the bottleneck.
- Matches the published JSON - the zip follows the same runnable workflow you can open on RunComfy.

When downloading for local ComfyUI makes sense - you want full control over models on disk, batch scripting, or offline runs.

How to use (local ComfyUI)
1. Load inputs (images/video/audio) in the marked loader nodes.
2. Set prompts, resolution, and seeds; start with a short test run.
3. Export from the Save / Write nodes shown in the graph.

Expectations - First run may pull large weights; cloud runs may require a free RunComfy account.

Overview

Turn your scene ideas into 8MP images with P-H3-Image. Start with a short text prompt. Generate in eight sampling steps. Preview the expanded prompt before sampling. Use expansion for added detail. Switch it off to keep your original wording.

Important nodes:

Key nodes in Comfyui P-H3-Image ComfyUI Workflow

Prompt upsampler (#18)

Expands your short request into a detailed prompt that enforces composition, lighting, and content constraints. Use it when you want consistent clarity from brief inputs; switch it off to write your own full prompt. If outputs become too wordy, simplify your original request and keep only the essentials.

Use prompt upsampler (#19)

A simple gate that routes either the expanded prompt or your original text into the model. Turn it off when you want total control over phrasing or to test baseline behavior. Turn it on to speed up ideation and reduce prompt engineering effort.

ResolutionSelector (#20)

Sets the aspect ratio and total pixels, defaulting to 8 MP for large, print‑friendly outputs. Keep its ratio aligned with the string embedded in Upsampler input (#17) for best prompt‑to‑canvas coherence. Increase pixels for more detail if your GPU memory allows, or reduce them for faster previews.

PH3ImageConditioning (#26)

Builds the positive conditioning and initializes a latent at the exact width and height you selected. Ensure the prompt arriving here is final, since this is what the sampler will follow. Changing size or text here affects both composition and detail density downstream.

MiniMaxH3SigmaShift (#23)

Adapts the sigma schedule for H3‑style sampling so eight steps remain stable at high resolution. Leave it on for default runs; disable or change only if you are experimenting with custom schedules. It works in concert with ManualSigmas (#6) and your sampler choice.

ManualSigmas (#6) and KSamplerSelect (#8)

These two control how denoising unfolds. Keep the eight‑step schedule for fast, high‑res results; increase steps only if you need extra micro‑texture or very fine typography. You can try alternative samplers for a different trade‑off between sharpness and smoothness.

RandomNoise (#9)

Sets the seed that drives variation. Lock the seed to reproduce a result exactly; change it to explore new compositions with the same prompt and settings.

Notes

P-H3-Image ComfyUI | 8MP Text to Image in 8 Steps - see RunComfy page for the latest node requirements.