Adjust Vertex Colors

adjust_vertex_colors.py

import bpy

bl_info = {
    'name': 'Adjust Vertex Colors',
    'author': 'Tamas Kemenczy',
    'version': (0, 1),
    'blender': (2, 6, 1),
    'location': 'View3D > Specials > Adjust Vertex Colors',
    'description': 'HSV vertex color adjustment of the selected faces',
    'category': 'Mesh'
}

def adjust_vertex_colors(obj, h, s, v):
    for index, face in enumerate(obj.data.vertex_colors.active.data):
        if obj.data.faces[index].select:
            face.color1.h += h
            face.color1.s += s
            face.color1.v += v

            face.color2.h += h
            face.color2.s += s
            face.color2.v += v

            face.color3.h += h
            face.color3.s += s
            face.color3.v += v

            face.color4.h += h
            face.color4.s += s
            face.color4.v += v

class AdjustVertexColors(bpy.types.Operator):
    bl_idname = 'mesh.adjust_vertex_colors'
    bl_label = 'Adjust Vertex Colors'
    bl_options = {'REGISTER', 'UNDO'}

    h = bpy.props.FloatProperty(name='Hue', min=-1, max=1, step=1)
    s = bpy.props.FloatProperty(name='Saturation', min=-1, max=1, step=1)
    v = bpy.props.FloatProperty(name='Value', min=-1, max=1, step=1)

    @classmethod
    def poll(cls, context):
        obj = context.active_object
        return (obj and obj.type == 'MESH')

    def execute(self, context):
        adjust_vertex_colors(context.active_object, self.h, self.s, self.v)
        return {'FINISHED'}

def menu_func(self, context):
    self.layout.operator(AdjustVertexColors.bl_idname, text='Adjust Vertex Colors')

def register():
    bpy.utils.register_module(__name__)
    bpy.types.VIEW3D_MT_object_specials.append(menu_func)

def unregister():
    bpy.utils.unregister_module(__name__)
    bpy.types.VIEW3D_MT_object_specials.remove(menu_func)

if __name__ == "__main__":
    register()