In this basic tutorial, I am going to turn water into Kool-Aid using the multiply blending option.
Here is the picture of a woman drinking water that I will begin with:
Now I will simply create a new layer by picking “New” and then “Layer” from the Layer menu.
Next, I will pick the color that I want to change the liquid to. In this case I will go with red.
I will then select the paintbrush and proceed to paint over the liquid on the new empty layer.
After I am done painting over the liquid, I will select multiply from the blending mode menu in the “Layers” window, located just under the “Layers” tab.
I will then turn down the fill (located below opacity on the right side of the “Layers” window).
What you end up is something like this:
Multiply is an often useful feature. It is good to exeperiment with the rest of the blending options in the menu as well.