Question

how does carpenter use black and white imagery when viewing through the glasses?
to create a nostalgic feeling for older films
to reduce production costs for special effects
to represent the aliens limited color vision
to strip away illusion and reveal stark reality

Explanation:

In the context of the film, the use of black - and - white imagery through the glasses is a thematic and symbolic choice. It is not about nostalgia for older films (a common but surface - level misinterpretation). Reducing production costs for special effects is not the artistic intent. Representing aliens' limited color vision is not the main point. The key is that the black - and - white imagery strips away the illusions of the normal, colorful world (like the false social norms, consumerist illusions, etc.) and reveals the stark reality (such as the true nature of people and the world beneath the surface).

Answer:

To strip away illusion and reveal stark reality