The camera settings located on the cameras main display are key as the will determine the way the image will look. below is an example of the canon 650d camera settings view.
also when an image is taken an uploaded it always takes along its information such as camera type, lens, iso settings and so on. an example of how these are displayed is shown below.
shutter speed - In photography and digital photography the shutter speed is the unit of measurement which determines how long shutter remains open as the picture is taken. The slower the shutter speed, the longer the exposure time. The shutter speed and aperture together control the total amount of light reaching the sensor. Shutter speeds are expressed in seconds or fractions of a second. For example 2, 1, 1/2, 1/4, 1/8, 1/15, 1/30, 1/60, 1/125, 1/250, 1/500, 1/1000, 1/2000, 1/4000, 1/8000. Each speed increment halves the amount of light.
aperture - A device that controls the amount of light admitted through an opening. In photography and digital photography , aperture is the unit of measurement that defines the size of the opening in the lens that can be adjusted to control the amount of light reaching the film or digital sensor. The size of the aperture is measured in F-stop.
ISO - ISO is the brightness sensitivity of the sensor. so if a photo is being take at night a higher sensitivity like ISO 3200 will be used so the image can be seen. same applies with day time for a setting of ISO 100 will make sure the image isn't too bright.
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