Comfyui Flux

Generate images locally using ComfyUI + Flux.1 Dev model. Zero API cost, strong text rendering. Use when: generating images locally, creating slides/PPT graphics, or when user says 'local image', '本地生图', 'flux', 'comfyui'. Requires ComfyUI running at localhost:8188. For face-consistent selfies, prefer wanx-image-generation skill instead.

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):

bash

# 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

bash

python3 {baseDir}/scripts/flux_generate.py --prompt "PROMPT" [OPTIONS]

Basic

bash

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)

bash

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):

bash

python3 {baseDir}/scripts/pulid_generate.py \
  --prompt "PROMPT" \
  --ref-image path/to/face.jpg [OPTIONS]

Basic (face-consistent portrait)

bash

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

bash

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 1.0 is balanced; increase to 1.2-1.5 for stronger likeness
• --steps 10 is 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.