"Some light contrast enhancements have been made to emphasise certain features and to bring out features in the shadowed areas. In reality, the comet is extreme

"Some light contrast enhancements have been made to emphasise certain features and to bring out features in the shadowed areas. In reality, the comet is extremely dark ­– blacker than coal. The images, taken in black-and-white, are grey-scaled according to the relative brightness of the features observed, which depends on local illumination conditions, surface characteristics and composition of the given area." http://www.esa.int/Our_Activities/Space_Science/Rosetta/Highlights/Top_10_at_10_km http://www.esa.int/Our_Activities/Space_Science/Rosetta/High...