Exposure is all about manipulating light for image effects. All digital photos are RGB photos, but here the image was converted to black and white and made darker during processing. Modern digital cameras allow for steady shots in lower light levels than ever before. You can change the ISO on the camera to raise the sensor's light sensitivity. The goal of all this is to record as many different and as wide range of brightness values or what are called tones, from the scene. Think of a piano keyboard. If you can play with more keys you will get a richer musical sound. Now think of those notes as dark and lught values. The wider the range of values the more interpretation is available to you. A photographic image is a continuous range of brightness values: continous tones is a lorge part of what makes for the illusion that a photograph is real rich tonal values and a range of colors allow us to more easuly buy into its magical illusion.
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