In the early seasons of the historical drama television series "Vikings," Travis Fimmel portrayed the character of Ragnar Lothbrok. The series was produced by MGM Television and the History Channel, and ran from 2013 to 2020. The question at hand pertains to whether Travis Fimmel's eye color was enhanced in post-production in the early seasons of the series.
According to an article published by IMDb, Travis Fimmel was born on July 15, 1979, in Echuca, Victoria, Australia. He has blue eyes. The article does not mention any enhancement of his eye color in post-production for any of his performances, including his role in "Vikings."
In an interview with Rolling Stone magazine, Travis Fimmel was asked about his character in "Vikings," and he discussed the physical demands of the role, including growing his hair and beard for the part. He did not mention any enhancement of his eye color.
In the absence of any official statements or reports indicating the enhancement of Travis Fimmel's eye color in post-production in the early seasons of "Vikings," it can be concluded that his eye color was not altered in post-production. Based on the available evidence, it appears that Travis Fimmel's natural blue eyes were used in the early seasons of "Vikings."
It is worth noting that the enhancement of actors' physical attributes in post-production is not an uncommon practice in the film and television industry. However, in the case of Travis Fimmel's performance in "Vikings," there is no evidence to suggest that his eye color was enhanced in post-production.