I think the issue here is, that even if film stills were used in the book, there’s no reason to assume the colors are accurate. For one both the scanning and printing would introduce inaccuracies. Then there’s the fact that the colors were likely adjusted to look appealing in the book, and not so much match the film. Just look at the Topps cards, which often contain many film stills, but none of them look like the real thing, with colors often balanced, or altered. The reality is that these photos are likely no more accurate than any of the telecines, where the colors can be in the ballpark, if the operator was going for accuracy, but usually are not .