Painting with Ambient Occlusion

Painting with Ambient Occlusion
CGCookie
Jonathan Hamilton
Photoshop

Jonathan Hamilton –
Here is an artist that has a unique look to his characters in which you are able to tell Jonathan
created this one. It’s that personal style that many artists long for and his tutorial covers the
foundations of the process to create something wonderful. He has a few step by steps on his site
that I recommend checking out! He has a fantastic tutorial explaining AO, so check it out and read
his tips on the steps along the way.


Jonathan: Ambient occlusion (AO) is best described as the soft, subtle shadowing that appears between close
objects and other tight spaces where light can’t easily reach. When emphasized in the painting process,
AO gives art a very distinct look — almost like a computer-generated 3D model.

After doing a few thumbnails to explore lighting possibilities for the piece, start off by drawing decently
clean line art and reducing the opacity.
Below that, begin working on the ambient occlusion layer.

To render AO, use a soft black brush on edges, and then a hard eraser to clean them up.
Slowly work around the piece, fleshing out forms and managing overlap until, eventually,
everything occupies a place within the three-dimensional space of the scene.
The finished AO layer is set to Multiply.

Flat colors are set beneath the AO layer and painted with an opaque brush. Every element of the painting,
from skin to clothing, should be on a separate layer. The values used are darker than what will appear in
the final piece — this step is intended to simulate how the scene appears when in shadow.

Light sources are added, one by one, on Overlay layers above the AO and flat colors.
Light is literally painted onto objects with a white brush. Later, they can be adjusted by using the
Hue/Saturation window.

Once all the lighting is set, the final step is to polish the painting through post-production,
the options of which include: over-painting, color adjustment layers, and/or screen effect.