Lufthansa is testing some adjustments to its new livery, including a brighter blue colour than the one originally chosen and a larger crane logo on the aircraft tail.
A Boeing 747-400 featuring the scheme arrived in Frankfurt yesterday and will be used to operate a Toronto service today.
The German carrier describes the updated colour as "optimised blue". It appears to have a purplish tinge.
The testing of a brighter paint comes after several commentators noted that the new livery seemed to darken to black in certain lighting.