There are a variety of different web sites that provide information pertaining to the color processing of raw stippled Bayer Tile Pattern images, including:
The following paper also presents a good overview of the subject of reconstructing color images from CCD Bayer-tiled arrays:
Download paper, " High-Quality Algorithm for Bayer Pattern Interpolation"
The Coriander project for Linux, which is available from SourceForge, also includes a large number of open source color interpolation algorithms. See the Related Article below for more information.