This post on lighting was borrowed from the Light & Shade section, which I hope to get to eventually. Reilly refers to these basic lighting conditions through out all aspects of the program, so I think it's important to add it now. I will return to this topic in more detail at a later date.
There are four basic lighting conditions to consider. Front Lighting, Form Lighting, Rim Lighting and Back Lighting.
Front Lighting:
In this lighting condition there is no shadow to help give us the illusion of form. It shows minute detail and local values well. This is perhaps the most challenging and least used lighting condition for painters.
Form lighting:
As its name implies, this lighting condition helps us define the illusion of three dimensions by giving us a light side and shadow side to create form. It is our best option for showing three dimensions. Typically three-quarters to two-thirds of the subject is illuminated by the light.
Rim Lighting:
In this lighting condition, the subject is three-quarters in the shadow and one-quarter in the light. The light is actually coming from behind the subject, creating a brilliant light. The lights are compressed within a two value range, typically between 8th value and 10th value, so the changes in the light are hard to determine. Most of the modeling is done in the now expanded shadow value range. Good for dramatic effect.
Back Lighting:
Similar to Rim Lighting but with out the edge light. Also good for drama. Be careful of over modeling.
© John Ennis 2011
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