"The grey colour of the Digi Grey serves as reference.

If the colours of the photo are not correct, the grey of the Digi Grey will register the defect. It will show the same deviations of colour as the rest of the photo even if the user does not see this deviation. For example, if the photo presents an orange-coloured aspect (we shall speak about orange-coloured "color cast"), the grey of the Digi Grey will become more orange-coloured in the same proportion. Also, for any other deviation of colour, even small and imperceptible to the unprofessional eye or if the monitor screen is not adjusted correctly.

It is then enough to measure this colorimetric deviation present in the grey of the Digi Grey on the reference photo and to apply the compensation correction.

Most of the graphic softwares have this function of compensation correction."

I am adding some additional information here on "grey cards" to follow on the topic of colour management. The extract comes from a website that sells one of these pocket size gray cards. In a sense we all need to have one in our camera bags to ensure that the colours of the photo's are correct. Fortunately colour corrections can be done after the photo was shot. Digital manipulations can then be done on your favourite computer application such as Adobe Photoshop.

Please click here to visit the Digi Grey site for additional information.