Elizabeth Allen is a principal lecturer in Imaging Science at the University of Westminster. She specialises in digital imaging systems and processes and image quality and has been the course leader of the BSc Photography and Digital Imaging since 2005. Her work has been presented at a number of symposia and has been published in related journals. She received the Selwyn Award from the Royal Photographic Society in 2005 and is currently working towards a PhD in imaging science. She is also a contributing author in the 7th and 8th editions of Langford's Advanced Photography. Sophie Triantaphillidou is a principal lecturer and director of the Imaging Technology Research Group at the University of Westminster. She received the Selwyn Award from the Royal Photographic Society and her PhD in imaging science in 2001. She specializes in image quality, image archiving and color imaging. She has been the chair of the Imaging Science Group of The Royal Photographic Society since 2007 and member of a number of conference program committees related to imaging science. She has published numerous research papers and is a contributing author in the 7th and 8th editions of Langford's Advanced Photography.