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Dolby, Qualcomm shed light on HDR tech (photos)

At Mobile World Congress, Qualcomm demonstrates JPEG-HDR, a Dolby Laboratories technology for capturing and showing a better range of dark and light tones than ordinary cameras can handle.

stephenshankland.jpg
Stephen Shankland
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1 of 7 Stephen Shankland/CNET

Conventional JPEG vs. tone-mapped JPEG-HDR

Qualcomm demonstrated JPEG-HDR, a Dolby Laboratories technology for capturing and showing a better range of dark and light tones than ordinary cameras can handle, on an Android tablet at Mobile World Congress. The demo showed an image of a church interior; on the left is the ordinary JPEG image and on the right is Dolby's tone-mapped view constructed from multiple exposures ranging in brightness.
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2 of 7 Stephen Shankland/CNET; poster by Jonathan Kong/Dolby

Human eye's dynamic range

Dolby explains that the human eye can capture 16 exposure values--measured here by F-stops--of dynamic range, which describes the span from light to dark in an image.
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3 of 7 Stephen Shankland/CNET; poster by Jonathan Kong/Dolby

The limits of cameras and conventional JPEG

A conventional digital camera (especially on a mobile phone) can capture a narrower dynamic range than a human eye. JPEG's 8-bit range can make matters worse, especially for those who want to edit an image.
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4 of 7 Stephen Shankland/CNET; poster by Jonathan Kong/Dolby

JPEG-HDR sales pitch

JPEG-HDR combines multiple exposures that capture a range of bright and dark values. Ordinary JPEG viewer software will see just a tone-mapped version boiled down from the HDR image, but Dolby's HDR software can explore the full range.
20120229_Dolby_HDR_MWC_006.jpg
5 of 7 Stephen Shankland/CNET

Conventional JPEG vs. tone-mapped JPEG-HDR

Qualcomm demonstrated JPEG-HDR, a Dolby Laboratories technology for capturing and showing a better range of dark and light tones than ordinary cameras can handle, on an Android tablet at Mobile World Congress. The demo showed an image of a church interior; on the left is the ordinary JPEG image and on the right is Dolby's tone-mapped view constructed from multiple exposures ranging in brightness.
20120229_Dolby_HDR_MWC_002.jpg
6 of 7 Stephen Shankland/CNET

Look at the bright side

Using JPEG-HDR explorer software, a person can tap an area of an image to adjust exposure for that area. Here, the dim interior of the church is selected.
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7 of 7 Stephen Shankland/CNET

Stained-glass windows with JPEG-HDR

Using JPEG-HDR explorer software, a person can tap an area of an image to adjust exposure for that area. Here, bright stained-glass windows are selected, and the rest of the church interior fades away. All the data for the imagery is stored in a conventional JPEG image, but only Dolby's JPEG-HDR software can explore the full range.

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