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Volume: 13 | Article ID: art00052
JPEG-HDR: A Backwards-Compatible, High Dynamic Range Extension to JPEG
  DOI :  10.2352/CIC.2005.13.1.art00052  Published OnlineJanuary 2005

The transition from traditional 24-bit RGB to high dynamic range (HDR) images is hindered by excessively large file formats with no backwards compatibility. In this paper, we demonstrate a simple approach to HDR encoding that parallels the evolution of color television from its grayscale beginnings. A tone-mapped version of each HDR original is accompanied by restorative information carried in a subband of a standard output-referred image. This subband contains a compressed ratio image, which when multiplied by the tone-mapped foreground, recovers the HDR original. The tone-mapped image data is also compressed, and the composite is delivered in a standard JPEG wrapper. To naïve software, the image looks like any other, and displays as a tone-mapped version of the original. To HDR-enabled software, the foreground image is merely a tone-mapping suggestion, as the original pixel data are available by decoding the information in the subband. Our method further extends the color range to encompass the visible gamut, enabling a new generation of display devices that are just beginning to enter the market.

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Greg Ward, Maryann Simmons, "JPEG-HDR: A Backwards-Compatible, High Dynamic Range Extension to JPEGin Proc. IS&T 13th Color and Imaging Conf.,  2005,  pp 283 - 290,

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