Thanks to Cristalab.com we’ll be able to learn the next trick in photoshop. There’s no doubt you’ll be able to learn many tips from this web site.

First of all we open our image (grey-scale), this will be our model:

We’ll duplicate so we can have two identical copies, if anything goes wrong, you’ll always have a backup.

Let’s decolor the skin, in order to do this, we go to Image/aAjustments/Hue/Saturation and we chose the color we wantl (if you have the default mode in Edition as Master, chose it), this are the value I’ve chosen:

Note: make sure you activate colorize so the color you chose is select. After clicking in accepting, it should be something like the example below.

Now we go to Action History and we chose the previous one (meaning, we undo the action we had just made, like when doing Ctrl. + z).

Now we chose the brush in tip: Historial Brush ( Y ). We go again into the History windows and we chose the box in the left side for Hue/Saturation, as below:

And then we start to paint (make sure the layer where you’re working is selected).

This should the final result.

Repeat all the steps again. In this case, after coloring the background and the lips, this is the final result:

I hope you liked it. The Historial Brush is also very useful when you need to color images up for corrections or shadows and many more things.