Normally, you might think of a grid spot for what it creates: a tight zone of light. But it also can be helpful to think of it in terms of the inverse: a grid also prohibits light from reaching everywhere else.
And the "everywhere else" part—that relative blackness you can create with a gridded key—is what can help you to amp the color palette in even a small room with light-toned walls.
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Strobist
