HDR involves a complex system of converting large amounts of dynamic range values into values that are able to be displayed with modern technology, discernible by the human eye and that look good to the human eye. Good HDR software will actually deal with pixel values clipped from excessive overexposure in its overall processing. For example if a pixel’s intensity is clipped in one image, then those image values should not be an important part of the final intensity values of the HDR render because the overexposed values are unknown so can not really be part of the final image.