Back in 2015, there was this interesting phenomenon about people seeing a photograph of a dress and coming down sharply on two different sides of what colors the dress was, with some saying it was white and gold and others that it was blue and black.
This short video explains what is going on and this phenomenon shows dramatically that our perception of color is not due exclusively to the spectrum of light wavelengths that is reflected off the image and enters our eyes, and thus entirely objective, but also depends on the way that our brain processes sensory input which in turn depends on factors such as the context in which the image is embedded, and thus has a subjective element as well.