The **@fitbit/image‑codec‑txi** library implements an encoder for the proprietary TXI image format used on Fitbit wearables. It provides a simple `encode` function that takes standard `ImageData` (width, height, pixel buffer) and optional settings (run‑length encoding, output pixel format) to produce a TXI file compatible with Fitbit devices. The package is intended for developers building apps or tooling that need to convert raw bitmaps into the device‑specific format.