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I had an exchange a few weeks ago on saturated backgrounds resulting from narrow depths of field. I am not sure that there is a scientific relationship between narrow depth of field and saturation, I believe there is a heightened sense of the background with a narrow depth of field and I am further convinced that the narrow depth of field and large aperture to get it encourages a bit of under exposure that results in saturation of primary colors. Try under-exposing with exposure compensation and you will more than likely see this. I used to shoot Kodak film rated at ISO 160 at 200 ISO so that when it was processed at 160 I got more realistic blues. The science helps you understand what is happening but it’s not necessary, it’s experimentation that takes you from understanding to doing.