I wanted a duotone effect on the photos on this site and at first I thought I would like to create it through CSS but what I found seemed to require adding extra HTML, which isn’t something I want to spend my time on for this site (I’m using GeneratePress and I’m not in the mood for a child theme at the moment), and as I was searching for different ways to create the effect, I came upon this little tutorial for Photoshop.
Title: Digging into Duotone: How to Create & Use Colorized Images in Web Design