In a past post I explained how to use SVG and a
feColorMatrix filter to apply a duotone effect to an image. This time I’m going to show how to achieve a similar effect with only CSS.
Demo & Code: https://codepen.io/jmperez/pen/wrVxga
The code consists of a
<div/> that has an image set as a background. Then, we add a
::before and an
::after pseudo-elements with the colours we want to apply and the right blend modes.
This version is based on the technique described by Una Kravets:
which is also what the colofilter.css library is based on to achieve the duotone effect.