BCGControlBar Pro for MFC
virtual void CBCGPRibbonBar::OnPrepareLightImages ( CBCGPToolBarImages images,
double  dblImageLum 

Called by the framework when a "light" (appeared on dark background) images needs to be prepared.

imagesA reference to the image list that should be prepared.
dblImageLumImage luminosity ratio.

By default, the framework calls images.MakeLighter if dblImageLum > 1 or images.MakeDarker if dblImageLum < 1. Override this method in a derived class to perform a custom action instead. For example, you may simplify images by calling images.Simplify or invert them (images.InvertColors).