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