Vertex Color Tools
"vcTools2 is a collection of many separate scripted tools for manipulating vertex colors. It includes 'Assign Vertex Colors' - 'Bake Radiosity' - 'Adjust R -G -B -H -S -V -Contrast' -'Scale/Clamp' -'Align/Weld Colors' -'Blur' -'Blend Edges' -'Pits and Peaks' - and more. The script works on individual objects as well as multiple objects. Be sure to view the helpfile for details."