Medical practitioners are today increasingly likely to make clinical judgements based on looking at an image on a display rather than direct viewing of the subject. Medical imaging has also been moving away from exclusively grayscale modalities towards increasing use of colour. The importance of accurate calibration and reproducible image capture and display has become more apparent, but standards and best practices in this field are still in development. Since 2013, the International Color Consortium has engaged with the medical imaging community to help understand the particular problems encountered and to help develop solutions. Currently the ICC Medical Imaging Working Group is working on a wide range of topics including digital microscopy, medical displays, ophthalmology, medical photography, multispectral imaging, petri dish imaging, dermatology, skin colour measurement, and 3-D imaging for surgery. In this overview, the problems in each of these areas are summarised and the current activity is described.