From the PopPhoto Flash Archives

Simulate the subtle shades of sunrise and sunset by adjusting the preset White Balance on your digital camera. Choose the Tungsten setting (light bulb icon) to add a bluish morning cast, or the Shade setting (cloud icon) to add the warm brownish tones of dusk. You’ll see a preview on the LCD monitor. The effect will be mild but can be exaggerated by underexposure.—Jon Sienkiewicz

Simulate the subtle shades of sunrise and sunset by adjusting the preset White Balance on your digital camera. Choose the Tungsten setting (light bulb icon) to add a bluish morning cast, or the Shade setting (cloud icon) to add the warm brownish tones of dusk. You'll see a preview on the LCD monitor. The effect will be mild but can be exaggerated by underexposure.
—Jon Sienkiewicz