# Threejs Exposure Color Grading

> Build a measured exposure and grading path in Three.js. Use for a 64x36 encoded luminance meter, asynchronous readback, weighted log-average exposure, asymmetric adaptation, single tone-map ownership, and a generated 32-cube post-tone-map LUT.

- **Type:** Skill
- **Install:** `agentstack add skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-exposure-color-grading`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [scottstts](https://agentstack.voostack.com/s/scottstts)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [scottstts](https://github.com/scottstts)
- **Source:** https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills/tree/main/skills/threejs-exposure-color-grading

## Install

```sh
agentstack add skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-exposure-color-grading
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Exposure and Color Grading

Treat exposure, tone mapping, grading, and output conversion as distinct stages. Tune them from measured HDR signal, not by stacking compensating color operations.

## Order

```text
HDR scene
  → luminance meter
  → adapted exposure
  → tone map
  → creative grade / 3D LUT
  → final output conversion
```

Read [references/scene-referred-color-pipeline.md](references/scene-referred-color-pipeline.md)
for the exact 64x36 meter, encoded readback, adaptation constants, 32-cube LUT,
and signal-ownership ambiguities.

## Failure conditions

- tone mapping occurs in both materials and post;
- exposure is used to repair physically inconsistent light ratios;
- meter weighting and scene framing are not inspected;
- adaptation speed is the same toward light and dark;
- LUT input/output spaces are undocumented;
- sRGB encoding happens twice;
- a display-domain LUT is moved before tone mapping without being rebuilt.

## Routing boundary

Use `$threejs-bloom` for HDR glow contribution and
`$threejs-image-pipeline` when this color path must share ownership with AO,
atmosphere, or effect-local render targets.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [scottstts](https://github.com/scottstts)
- **Source:** [scottstts/Threejs-Awesome-Graphics-Agent-Skills](https://github.com/scottstts/Threejs-Awesome-Graphics-Agent-Skills)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-scottstts-threejs-awesome-graphics-agent-skills-threejs-exposure-color-grading
- Seller: https://agentstack.voostack.com/s/scottstts
- Browse the marketplace: https://agentstack.voostack.com/browse

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