Contributed to the maplibre-gl-js repository by developing a feature that enhances raster data fidelity for front end mapping applications. The work focused on preserving raw RGBA values in raster tiles by disabling alpha premultiplication, which is essential when the alpha channel encodes data rather than opacity. Using TypeScript and leveraging WebGL-based rendering, the implementation allows raster sources to maintain data integrity and supports more accurate data-driven visualizations. The approach extended the raster source handling within the map rendering pipeline, ensuring that data-encoded alpha channels are rendered correctly. The work emphasized robust testing and careful integration into the existing codebase.