BCGControlBar Pro for MFC
void CBCGPRibbonBar::SetImagesLuminosityInDarkThemes ( double  dblRatio,
BCGPRibbonGalleryIconsLook  galleryIconsLook = BCGPRibbonGalleryIconsLook_Original 
)

Specifies the Ribbon images luminosity in the dark themes.

Parameters
dblRatioThe luminosity ratio (less 1 - darker image, greater 1 - lighter image, 0 - simplified image).
galleryIconsLookThe gallery icons appearance.