“Ambient light is the naturally available light. Sources would be the sun, moon, or reflected light. Sunlight is the light source even on cloudy days or in the shade. Cloud cover offers soft, diffused light without harsh shadows or contrast. Ambient light can be dramatic like the previous photo, or soft like the photo to the left. Dramatic lighting often requires a wide range in tonal quality in the image. The previous photo was exposed for the light rays coming through the clouds.” ( for complete book excerpt  dpb-exp-comp-pg7 )