74 Applying Image Effects
Merging bracketed photos
High Dynamic Range (HDR) merge, or tone mapping, is used to combine
bracketed photos or scanned images from film, each shot taken at different
exposure levels (typically one each for highlights, midtones, and shadows) and
within seconds apart. Your camera can't capture all exposure levels in a single
shot, so by bringing together multiple photos you can expand your image's
dynamic range which would otherwise be impossible in a single shot.
Typically, scenes of high contrast such as landscapes, sunsets or indoor
environments (with strong lighting) are suited to HDR Merge.
(A)Exposure for Highlights, (B) Midtones,
(C) Shadows, (D) and the Merged output.
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