property OnPixelCombine: TPixelCombineEvent;
type TPixelCombineEvent = procedure(F: TColor32; var B: TColor32; M: TColor32) of object;
This event is redirected from the bitmap image, in order to make it accessible in the Delphi's Object Manager. There is no difference between using TCustomImage32.OnPixelCombine and TBitmap32.OnPixelCombine.