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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http://strobist.blogspot.com/2018/10/slc-2l-04-use-tight-grid-to-create-color.html