I made the following image in PDF format (a figure for a scientific work):
On my Linux machine, I've opened this image in evince and okular and it looks like it appears here just fine. It also appears this way on Google Drive.
Why are the colors blending in Preview, and is there a way to keep this from happening? (I will need to send this figure as part of a work for a printer to print off and I would like to guarantee that the figure stays "whole" for the printing.)