# 📐 L2 Spec — Image Super-Resolution Real-World Spec (Real-ESRGAN family)
**ID:** `L2-383-001` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-383`](/artifact/l1/L1-383)
> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.42 · **Delta tier:** 5
> **⛓ On-chain block:** 41555200
---
## 1. Domain Ω
**Type:** `range`
| Parameter | Unit | Range |
|---|---|---|
| H | px | 64 – 1024 |
| W | px | 64 – 1024 |
| S | — | 2 – 8 |
| Jpeg q | — | 20 – 100 |
| Noise level | — | 0.0 – 0.08 |
| Sub pixel shift | — | 0.0 – 1.0 |
| Kernel type error | — | 0.0 – 0.5 |
## 2. Tolerance (ε)
**Type:** `fn`
```
22.0 + 3.0 * (4 / s) - 8.0 * noise_level + 0.02 * log10(jpeg_q)
```
## 3. Difficulty
| Property | Value |
|---|---|
| Difficulty score | 0.42 |
| Delta tier | 5 |
## 4. Fingerprint
`3dc8e98ed08172f907efced9361b57fca010100677edc936445403986c51c4b2`
## 5. On-chain Registration
- **Chain hash:** `0xd3c42987a96aa24c6f7099e6f8f1439e7adb7f59fb2c3ec2e0a95b7491e97ffe`
- **Chain tx hash:** `0xca6da37604195c007ee80183fb00ab510f9059da8292c6933274d5fc209aa486`
- **Chain block:** `41555200`
---
## File Mapping
This bundle consists of: `L2-383-001.md`, `L2-383-001.json`.
| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-383-001.md` | Source of truth — edit this | Human or LLM |
| `L2-383-001.json` | Structured metadata for the registry | LLM regenerates from the sections above |
**Prompt for your LLM after editing this Markdown:**
> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.
_This Markdown was auto-synthesized from the catalog row for `L2-383-001`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._