<div class="duotone">
  <img src="http://source.unsplash.com/HvZDCuRnSaY/800x600" alt="A group of friends, sat on stairs, smiling" />
</div>
.duotone {
  position: relative;
  margin: 0 auto;
}

.duotone::before,
.duotone::after {
  content: "";
  display: block;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
  z-index: 1;
}

.duotone img {
  filter: grayscale() brightness(110%);
}

.duotone::after {
  background: hotpink;
  mix-blend-mode: multiply;
}

.duotone::before {
  background: navy;
  mix-blend-mode: lighten;
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.