JPEG-HDR: a backwards-compatible, high dynamic range extension to JPEG

  • Authors:
  • Greg Ward;Maryann Simmons

  • Affiliations:
  • Sunnybrook Technologies;Walt Disney Feature Animation

  • Venue:
  • SIGGRAPH '05 ACM SIGGRAPH 2005 Courses
  • Year:
  • 2005

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Abstract

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.