Dermoscopy colour tinge correction

Dermoscopy uses fluid immersion to suppress reflection from stratum corneum. Immersion optically couples the object to the glass causing a colour tinge of the image. DermaSpec® device has patches of known colour constantly present in the image. Those patches allow measurement and subsequent removal of the tinge from the calibrated images.

The image below shows the same color patch with two different backgrounds. The background colour shifts all colours of the image. It "leaks" onto the patches as can be seeing on zoomed sub-merges of the patches permitting measurement of the colour shift.