C'mon Fuji - Please Give Us A Proper RGB Histogram!

Thank you, Trevor, for your detailed study and explanations.  I have a Canon SX30 (luminance histogram only) and was wondering why the colours of my flower photos often look inaccurate or washed out.  After reading your thread, I found clipping of colours using PhotoShop.  Thank you for the tip about the spiky peaks in the luminance histogram.  Your information will be very useful.