Eyedropper doesn't pick up the correct color
I'm trying to select a color in a pdf that was placed in an InDesign document. The eyedropper won't pick up the correct color. It's consistently choosing a color that's darker than the color I want. I have zoomed in all the way so I can click on individual pixels, but that doesn't make a difference. I'm clicking on a light gray (almost white) pixel and the eyedropper is choosing a dark gray.
The layer with the pdf is the active layer and it is unlocked. I'm using InDesign CC 14.0.1