The Freeform Pen Tool allows us to draw vector shapes and paths (shape outlines) automatically adding anchor points.
In the Toolbox, select the Freeform Pen Tool. Choose on the Options bar drawing mode: to draw vector shape layers click button...

The Single Column Marquee Tool creates one pixel wide and all image high column selections.
To select a row In the Toolbox, select the Single Column Marquee Tool and click on the image. While New selection option choosen on the Options bar...

The Default Actions.atn contains just a few actions selected from 6 pre-packaged sets. Let's try some other actions.

If you are a bit confused about the color separation , you can try it in practice now. The dialog box itself is a perfect visualization of this theory...

So, say you want to duplicate and use an exact color that you've seen somewhere and have it scanned in to your computer. Taking this color data collection stuff a little bit further (see how I'm rounding out your education already?)...

No need to experiment with filters or layer-styles. Just 5 steps to follow and you'll have an easy solution to all your tatoo-needs!

Editor's Pick in Photoshop Tutorials, December 2006
This Photoshop tutorial will show you the easy way to create a Face Texture. The author gives you ten easy to understand steps that are well illustrated. What a wild effect.

1. Select the Pen Tool option (Press the letter P on the keyboard). Hold the mouse click and the drop down option reveals five different Pen options.
2. Using Pen Tool with Shape Layer. This basically creates a Vector Color Filled Shape based on the foreground color of your choice...

Make a new document, 1000x1000 pixels black background.
On a new layer, with the eliptical marquee tool, create a perfect circle (keep pressed the Shift key) and fill it with white.
Apply a 6 px stroke layer style (Layer -> Layer Style -> Stroke) of color #B59605 to the circle.