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HDR Image
Strictly speaking, an HDR image is an intermediary image with 32 bits per color channel
(96 bits per pixel). An HDR image is the result of merging photos of the same
scene taken under different exposure settings and stored in special HDR image format.
The 32-bit intermediary HDR image must be processed with tone mapping for
proper display on standard monitors and prints. It has become very common to define
"HDR image" as the result of processing the 32-bit HDR image with tone mapping
(i.e. the tone mapped outpu) but this is not technically correct
Tone Mapping
Processing a 32-bit HDR image into an image that can be properly viewed on
monitors and in prints.
Exposure Fusion
Combination of bracketed photos in such a way that highlight details are taken from
the underexposed photos and shadow details from the overexposed ones.
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