Apparently competing dpi settings

@dcouzin wrote:

Trying to figure out how PDF Creator sets its quality. There are three dpi inputs:
.#1. in printer properties, advanced, there's a graphic print quality in dpi
.#2. in the profile under pdf compression there's a resample setting for color/greyscale images to so many dpi
.#3. in the profile under pdf compression there's resample setting for monochrome (i.e. black/white) images to so many dpi

Aren't #2&#3 competing with #1? I find that #2&#3 nearly determine the PDF quality, but how #1 is set still has a small effect on file size. For example, when I made:
.#1 = 2400; #2 = 600; #3 = 1200 the resulting PDF was 67,750 KB
.#1 = 600; #2 = 600; #3 = 1200 the resulting PDF was 67,651 KB
.#1 = 300; #2 = 600; #3 = 1200 the resulting PDF was 67,600 KB

So what exactly does #1 do? What is its relation to #2&#3?

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