bertha_ requested a tutorial for this icon found in this post. Just a heads up, this tutorial is just a guide. These specific settings will only work best on base images like this one. The settings all depend on the image and it's original colouring. In order for you to receive the same effects, try finding an image with the same overly red colouring. Still, each image is different which is why you must still play around with settings that will suit your icon.