Tartan ID from paintings

[figheadair]

Here's an example of how not to do it.

The portrait of Sir George Macpherson-Grant by Sir George Hayter c1838-40.


Here is the tartan as extracted by Dr. Phil Smith which he called, completely without authority, Macpherson-Grant.


Quite how Smith arrived at this setting is beyond me. The portrait is more thematic than detailed but there is sufficient detail to allow an extraction of the sett which is obviously the standard Grant/Drummond tartan.