"Page header accent color" as color source flashes color on PDFs

[nt1m]

Example: https://poll.qu.edu/images/polling/us/us12192018_ulfj59.pdf/

This is because "Page header accent color" continuously screenshots the 200 top pixels of a page and computes the dominant color which changes as the PDF loads.

I guess I could make sure it only computes the header color once, or take less pixels on top.

[nt1m]

Hmm, looks like scrolling through the PDF triggers {status: "complete"} tab updates every time...