每日备份 2026-03-27

2026-03-27 23:38:45 +08:00
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+# Background Removal
+
+Extract subjects from images with transparent backgrounds.
+
+## Tools
+
+### remove.bg (API)
+
+```bash
+curl -X POST "https://api.remove.bg/v1.0/removebg" \
+  -H "X-Api-Key: YOUR_API_KEY" \
+  -F "image_file=@photo.jpg" \
+  -F "size=auto" \
+  -o "result.png"
+```
+
+```python
+import requests
+
+response = requests.post(
+    "https://api.remove.bg/v1.0/removebg",
+    files={"image_file": open("photo.jpg", "rb")},
+    data={"size": "auto"},
+    headers={"X-Api-Key": "YOUR_API_KEY"}
+)
+with open("result.png", "wb") as f:
+    f.write(response.content)
+```
+
+**Pricing:** ~$0.20/image (50 free/month)
+
+### ClipDrop (Stability AI)
+
+```python
+import requests
+
+response = requests.post(
+    "https://clipdrop-api.co/remove-background/v1",
+    files={"image_file": open("photo.jpg", "rb")},
+    headers={"x-api-key": "YOUR_API_KEY"}
+)
+```
+
+**Features:** Background removal, cleanup, relighting
+
+### Photoroom API
+
+```python
+response = requests.post(
+    "https://sdk.photoroom.com/v1/segment",
+    files={"image_file": open("photo.jpg", "rb")},
+    headers={"x-api-key": "YOUR_API_KEY"}
+)
+```
+
+### Local (rembg)
+
+```bash
+pip install rembg
+
+# CLI
+rembg i input.jpg output.png
+
+# Python
+from rembg import remove
+from PIL import Image
+
+output = remove(Image.open("input.jpg"))
+output.save("output.png")
+```
+
+**Models:**
+- `u2net` — General purpose (default)
+- `u2net_human_seg` — Optimized for people
+- `silueta` — Faster, smaller
+
+## Batch Processing
+
+```python
+from rembg import remove
+from pathlib import Path
+
+for img_path in Path("input/").glob("*.jpg"):
+    result = remove(Image.open(img_path))
+    result.save(f"output/{img_path.stem}.png")
+```
+
+## Edge Refinement
+
+Raw removal often has rough edges:
+
+1. **Feather edges** — Gaussian blur on alpha channel
+2. **Matting models** — Use dedicated matting for hair/fur
+3. **Manual cleanup** — Touch up in photo editor
+
+## Use Cases
+
+- Product photography
+- Profile pictures
+- Compositing
+- E-commerce listings
+- Marketing materials
+
+## Quality Tips
+
+- **Good lighting** — clear subject separation helps
+- **High contrast** — distinct foreground/background
+- **Clean backgrounds** — simpler = better results
+- **Check hair/fur** — often needs manual refinement