Our overlay blend mode is definitely a lot more involved, but if you really break down the function, you will notice that it is simply a multiply blend mode and screen blend mode. In this case, we are doing a conditional check to apply one or the other blend mode to a pixel.
With this particular screen effect, when the overlay function receives a pixel, it checks to see whether it is less than 0.5. If it is, then we apply a modified multiply blend mode to that pixel; if it's not, then we apply a modified screen blend mode to the pixel. We do this for each pixel for each channel, giving us the final RGB pixel values for our screen effect.
As you can see, there are many things that can be done with screen effects. It really ...
