I have also included a picture of two Denmark stamps, that are supposed to be brown. I have found this website that allows one to upload a stamp and they will then give a report on the percentage of the different colours on the stamp. However if you look closely you will see that parts of the top stamp are brown and parts are a dull green.
As technology progresses, I wonder if it would be a good idea to include an analysis of the colour of a stamp when cataloguing it, or perhaps give a colour analysis when describing a stamp. I can see that there could be a difficulty if the cancellation is overpowering, but maybe there could be some merit in giving a particular stamp a colour identity.
Some thoughts on this problem would be appreciated.
Alan Parry