Output to PDF thumbnails needs a color profile setting you can adjust. Current Bridge CC 2019 is terrible. The images are always too dark and over saturated. Clients don't understand. This needs immediate attention.
The top layer is from Photoshop ContactSheet II. The bottom layer is Bridge.
Request you to share some sample files with email@example.com
Same problem for me!!! The output resolution is also very low, even set to 300dpi images are very pixelated.
I'm getting the same issue. Bridge 2017 seems to still work fine but 2018 and 2019 both creating wildly inaccurate PDFs