It is up until 1967 when television sets were in black and white. Take note that even before the year 1967, some television shows were trying to place their shows in color. Some have reported seeing colored shows back in 1953 but the shows only had limited color and not full-color like the shows that we have today. The change of television from being black and white to colored is gradual.
This is the same with the movies that are being produced too. They have started out in black and white and eventually changed to colored sets over the past years. Right now, the shows that we watch seem very real. The colors are surely clear, especially when compared to colored sets in the past.