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.