rio-color

rio-color is a rasterio plugin developed by Mapbox, providing essential color correction capabilities for geospatial rasters. Its design prioritizes lightweight operation with no heavy dependencies, ensuring predictable memory usage by iterating over internal image blocks.

The plugin leverages rio-mucho for multi-core processing and includes highly optimized C functions for efficient colorspace conversions. It supports both a Command Line Interface (CLI) and a Python module, allowing for flexible integration into workflows for in-memory NumPy arrays. Key operations include Gamma adjustment for brightening midtones and reducing atmospheric haze, Sigmoidal contrast for non-linear image enhancement, and Saturation adjustment for controlling color intensity. The plugin guarantees that all GeoTIFF metadata, tiling, compression, and nodata values are preserved from input to output.