My What and Why of HDR imaging
Like many other photographers today, I like HDR (High Dynamic Range) images, and making them.
First, what is HDR imaging? A short definition is these are images formed by taking several images of the same subject, but changing the settings of the camera to collect more visual light data. The human eye is able to see a dynamic range or luminosity of the subject matter of approximately twenty EV (exposure value, or amount of light). Film cameras see approximately four EV, and a digital camera sensor is able to see approximately eight to nine EV.
Since the human eye is able to process this greater EV, we see more of the light and dark in a typical scene. To accomplish the same EV for display by a digital camera we need a minimum of three exposures. I prefer to use five to seven exposures.
Next will be how we accomplish the added exposures.
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