每日备份 2026-03-27

2026-03-27 23:38:45 +08:00
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+# Style Transfer
+
+Transform image style while preserving content.
+
+## Techniques
+
+### img2img (Stable Diffusion)
+
+```python
+from diffusers import StableDiffusionImg2ImgPipeline
+import torch
+
+pipe = StableDiffusionImg2ImgPipeline.from_pretrained(
+    "runwayml/stable-diffusion-v1-5",
+    torch_dtype=torch.float16
+)
+pipe.to("cuda")
+
+result = pipe(
+    prompt="oil painting style, impressionist",
+    image=init_image,
+    strength=0.6,  # 0=no change, 1=full generation
+    guidance_scale=7.5
+).images[0]
+```
+
+**Strength parameter:**
+- 0.3-0.4 — Light style, preserves most detail
+- 0.5-0.6 — Balanced transformation
+- 0.7-0.8 — Heavy restyle, may lose detail
+
+### ControlNet
+
+```python
+from diffusers import StableDiffusionControlNetPipeline, ControlNetModel
+
+controlnet = ControlNetModel.from_pretrained(
+    "lllyasviel/sd-controlnet-canny",
+    torch_dtype=torch.float16
+)
+pipe = StableDiffusionControlNetPipeline.from_pretrained(
+    "runwayml/stable-diffusion-v1-5",
+    controlnet=controlnet,
+    torch_dtype=torch.float16
+)
+
+# Extract edges for structure guidance
+import cv2
+canny = cv2.Canny(image, 100, 200)
+
+result = pipe(
+    prompt="anime style illustration",
+    image=canny,
+    num_inference_steps=30
+).images[0]
+```
+
+**ControlNet modes:**
+- `canny` — Edge detection
+- `depth` — Depth map
+- `pose` — Human pose
+- `lineart` — Line drawing
+
+### IP-Adapter (Style Reference)
+
+```python
+from diffusers import StableDiffusionPipeline
+from transformers import CLIPVisionModelWithProjection
+
+# Use reference image as style guide
+pipe.load_ip_adapter("h94/IP-Adapter", subfolder="models")
+pipe.set_ip_adapter_scale(0.6)
+
+result = pipe(
+    prompt="a portrait",
+    ip_adapter_image=style_reference,  # Your style image
+    image=content_image
+).images[0]
+```
+
+## Style Types
+
+| Style | Prompt Keywords |
+|-------|-----------------|
+| Oil painting | oil painting, brushstrokes, impasto |
+| Watercolor | watercolor, soft edges, wet medium |
+| Anime | anime style, cel shaded, studio ghibli |
+| Pencil sketch | pencil drawing, graphite, sketch |
+| 3D render | 3D render, octane, blender |
+| Pixel art | pixel art, 8-bit, retro |
+| Photorealistic | hyperrealistic, photography, DSLR |
+
+## Workflow
+
+1. **Choose technique** based on control needed
+2. **Start with low strength** (0.3-0.4)
+3. **Iterate** — adjust strength and prompt
+4. **ControlNet** for precise structure preservation
+5. **Post-process** — color match to original if needed
+
+## Best Practices
+
+- **Lower strength = more original** — start low
+- **ControlNet for precision** — when structure matters
+- **Style reference images** — IP-Adapter for specific styles
+- **Consistent results** — lock seed, batch variations
+- **Resolution** — match input resolution
+
+## Common Issues
+
+- **Lost detail** — reduce strength
+- **Wrong style** — add more specific keywords
+- **Artifacts** — increase steps, reduce guidance
+- **Color shift** — color correct after