page_title: High-dynamic-range imaging
section_title: Multiple exposures anomalies
hierarchical_section_title: High-dynamic-range imaging / Examples / Multiple exposures anomalies
caption_attribution_description: English: Golf swing captured in Fall 2016 by Apple iPhone 6. High-Dynamic-Ranging (HDR) enabled getting good exposure on both the shaded grass and the bright sky. However, the merging of images by HDR created a ghost effect from the fast moving subject.
context_page_description: High-dynamic-range imaging is a technique used in photographic imaging and films, and in ray-traced computer-generated imaging, to reproduce a greater range of luminosity than what is possible with standard digital imaging or photographic techniques. Standard techniques allow differentiation only within a certain range of brightness. Outside this range, no features are visible because in the brighter areas everything appears pure white, and pure black in the darker areas. The ratio between the maximum and the minimum of the tonal value in an image is known as the dynamic range. HDRI is useful for recording many real-world scenes containing very bright, direct sunlight to extreme shade, or very faint nebulae. High-dynamic-range images are often created by capturing and then combining several different, narrower range, exposures of the same subject matter.
  The two primary types of HDR images are computer renderings and images resulting from merging multiple low-dynamic-range or standard-dynamic-range photographs. HDR images can also be acquired using special image sensors, such as an oversampled binary image sensor.
context_section_description: A fast-moving subject (or unsteady camera) will result in a "ghost" effect or a staggered-blur strobe effect, as a result of the merged images not being identical, but each capturing the moving subject at a different moment in time, with its position changed. Sudden changes in the lighting conditions (e.g. a cloud blocking the sun) can also interfere with the desired results, by producing one or more HDR layers that do have the luminosity expected by an automated HDR system, though one might still be able to produce a reasonable HDR image manually in software by rearranging the image layers to merge in order of their actual luminosity.
caption: This image captured by an iPhone 6 benefited from HDR by exposing both the shaded grass and the bright sky, but the fast-moving golf swing led to a "ghost" club.
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