每日备份 2026-03-27

2026-03-27 23:38:45 +08:00
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+# Upscaling
+
+Increase image resolution with AI enhancement.
+
+## Tools
+
+### Real-ESRGAN (Local, Free)
+
+```bash
+# Install
+pip install realesrgan
+
+# CLI
+realesrgan-ncnn-vulkan -i input.jpg -o output.png -n realesrgan-x4plus
+```
+
+```python
+from realesrgan import RealESRGAN
+import torch
+
+model = RealESRGAN(torch.device("cuda"), scale=4)
+model.load_weights("weights/RealESRGAN_x4plus.pth")
+
+result = model.predict(input_image)
+```
+
+**Models:**
+- `realesrgan-x4plus` — General images (4x)
+- `realesrgan-x4plus-anime` — Anime/illustrations
+- `realesr-general-x4v3` — Latest general model
+
+### Topaz Gigapixel AI
+
+Commercial desktop app:
+- Up to 6x upscale
+- Face recovery built-in
+- Batch processing
+- ~$99 one-time
+
+### Magnific AI
+
+```bash
+curl -X POST "https://api.magnific.ai/v1/upscale" \
+  -H "Authorization: Bearer YOUR_API_KEY" \
+  -F "image=@photo.jpg" \
+  -F "scale=2"
+```
+
+**Features:**
+- "Creativity" slider adds AI detail
+- Best for artistic enhancement
+- ~$0.50/image
+
+### Replicate (Various Models)
+
+```python
+import replicate
+
+output = replicate.run(
+    "nightmareai/real-esrgan:42fed1c4974146d4d2414e2be2c5277c7fcf05fcc3a73abf41610695738c1d7b",
+    input={
+        "image": open("photo.jpg", "rb"),
+        "scale": 4,
+        "face_enhance": True
+    }
+)
+```
+
+## Scale Factors
+
+| Original | 2x | 4x | 8x |
+|----------|-----|-----|-----|
+| 512x512 | 1024 | 2048 | 4096 |
+| 1080p | 4K | 8K | — |
+| 720p | 1440p | 4K | 8K |
+
+**Rule:** Don't upscale beyond 4x in one pass for best quality.
+
+## When to Upscale
+
+- **Print production** — need 300 DPI
+- **Large displays** — billboards, banners
+- **Old photos** — restore low-res originals
+- **AI-generated images** — increase from 1024px
+
+## Pipeline Order
+
+1. **Restore faces first** — GFPGAN/CodeFormer
+2. **Remove artifacts** — denoise if needed
+3. **Upscale** — Real-ESRGAN or similar
+4. **Sharpen** — light unsharp mask if soft
+
+## Quality Tips
+
+- **Don't over-upscale** — 4x max in one pass
+- **Match model to content** — anime model for anime
+- **Face enhance** — enable for portraits
+- **Check artifacts** — AI can add weird textures
+- **Preserve grain** — add back film grain if needed
+
+## Comparison
+
+| Tool | Scale | Speed | Quality | Cost |
+|------|-------|-------|---------|------|
+| Real-ESRGAN | 4x | Fast | Good | Free |
+| Topaz | 6x | Medium | Excellent | $99 |
+| Magnific | 2-4x | Medium | Best (creative) | $$$ |
+| Replicate | Varies | Fast | Good | Per-use |