ComfyUI Flux.1 Dev — Local Image Generation
Generate images locally via ComfyUI API + Flux.1 Dev. No API cost, excellent text rendering.
Prerequisites
ComfyUI must be running (default port 8200):
# 启动
bash /Users/chrisliu/ComfyUI/start.sh
# 关闭
bash /Users/chrisliu/ComfyUI/stop.sh
Override URL via env: COMFYUI_URL=http://127.0.0.1:8200
Models (already installed):
flux1-dev.safetensors(diffusion model)t5xxl_fp8_e4m3fn.safetensors+clip_l.safetensors(text encoders)ae.safetensors(VAE)
Usage
python3 {baseDir}/scripts/flux_generate.py --prompt "PROMPT" [OPTIONS]
Basic
python3 {baseDir}/scripts/flux_generate.py \
--prompt "A professional presentation slide with title 'AI Revolution' in bold white text on dark gradient background"
Custom Size (e.g. 16:9 for PPT slides)
python3 {baseDir}/scripts/flux_generate.py \
--prompt "..." \
--width 1344 --height 768
Parameters
| Parameter | Default | Description |
|---|---|---|
--prompt |
(required) | Image description |
--negative |
"" | Negative prompt |
--width |
1024 | Image width |
--height |
1024 | Image height |
--steps |
20 | Sampling steps (more = better but slower) |
--cfg |
1.0 | CFG scale (Flux works best at 1.0) |
--seed |
random | Reproducibility seed |
--output |
auto | Output path (default: generated-images/flux-{ts}.png) |
--timeout |
600 | Max wait seconds |
Common Sizes
| Use Case | Size | Flag |
|---|---|---|
| Square | 1024×1024 | (default) |
| PPT 16:9 | 1344×768 | --width 1344 --height 768 |
| Portrait | 768×1344 | --width 768 --height 1344 |
| Landscape | 1344×768 | --width 1344 --height 768 |
PuLID Face-Consistent Generation
Generate images with a reference face using PuLID-Flux (zero API cost, zero censorship):
python3 {baseDir}/scripts/pulid_generate.py \
--prompt "PROMPT" \
--ref-image path/to/face.jpg [OPTIONS]
Basic (face-consistent portrait)
python3 {baseDir}/scripts/pulid_generate.py \
--prompt "a girl sitting in a cafe, warm afternoon light, casual outfit" \
--ref-image avatars/kimi.jpg
Custom size + weight
python3 {baseDir}/scripts/pulid_generate.py \
--prompt "a girl on the beach at sunset, wearing a sundress" \
--ref-image avatars/kimi.jpg \
--width 1024 --height 1024 \
--weight 1.2
PuLID Parameters
| Parameter | Default | Description |
|---|---|---|
--prompt |
(required) | Image description |
--ref-image |
(required) | Reference face image path |
--negative |
"" | Negative prompt |
--width |
768 | Image width |
--height |
1024 | Image height (portrait default) |
--steps |
10 | Sampling steps (PuLID works well with fewer) |
--cfg |
3.5 | Guidance scale |
--seed |
random | Reproducibility seed |
--weight |
1.0 | Face similarity weight (0.0-5.0, higher = more similar) |
--start-at |
0.0 | PuLID start timestep |
--end-at |
1.0 | PuLID end timestep |
--output |
auto | Output path (default: generated-images/pulid-{ts}.png) |
--timeout |
600 | Max wait seconds |
PuLID Notes
- Default portrait orientation (768×1024) — good for face shots
--weight 1.0is balanced; increase to 1.2-1.5 for stronger likeness--steps 10is enough for PuLID; increase to 20 for more detail- First run is slower (loads PuLID + InsightFace + EVA-CLIP models)
- No content censorship — can generate anything locally
Strengths vs API (qwen-image)
- ✅ Free — no API cost
- ✅ Excellent text/typography rendering (great for slides!)
- ✅ High detail and consistency
- ⚠️ Slower on Mac (~1-3 min per image)
- ❌ No native face-consistency (use PuLID/IPAdapter for that)
Output
Prints MEDIA:<path> — auto-attached to chat reply. Default saves to generated-images/.
Troubleshooting
If ComfyUI is not running, the script exits with an error and prints startup instructions.