# Lctio Retiff

> Use when modifying or debugging lctio.retiff, TIFF rewrite behavior, or the retiff CLI.

- Skill: `llnl/lctio-retiff` (Agent Skill)
- Install (CLI): `npx skillmds@latest add llnl/lctio-retiff`
- Raw SKILL.md: https://api.skillmd.com/api/skills/llnl/lctio-retiff/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: llnl (https://skillmd.com/u/llnl)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/llnl/lctio-retiff

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# LCTIO Retiff

Use this skill when a task touches `src/lctio/retiff/` or the `retiff` command.

## Current Behavior

- `retiff` reads a TIFF file and rewrites it with simpler storage and minimal metadata.
- The tool preserves image shape, sample values, and photometric interpretation.
- The library entry point is `lctio.retiff.rewrite()`.
- The CLI entry point is `retiff`, defined in `pyproject.toml`.

## Important Constraints

- Only single-page TIFF files are supported. Multi-page input should raise an error.
- The project intentionally relies on PIL for broad TIFF read compatibility and `tifffile` for writing.
- The repository does not depend on `imagecodecs`.

## CLI Examples

- `retiff input.tif`
- `retiff input.tif -o output_dir/`
- `retiff *.tif -o simplified/`
- `retiff input.tif -v`