developing "true hdr" for the iphone
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![Page 1: Developing "True HDR" for the iPhone](https://reader034.vdocuments.us/reader034/viewer/2022051815/5404f9f58d7f72a6768b495b/html5/thumbnails/1.jpg)
Developing the “True HDR” app
for iPhone
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Why HDR?
Often, you see a beautiful scene but you cannot capture it on camera.
You get the sky but the rest of the picture is too dark...
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Why HDR?
Or, you get the shadows but the sky is washed out.
Your eyes perceive high dynamic range but most cameras have low dynamic range.
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Capture what your eyes see, via computational means
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Capture what your eyes see, via computational means
![Page 6: Developing "True HDR" for the iPhone](https://reader034.vdocuments.us/reader034/viewer/2022051815/5404f9f58d7f72a6768b495b/html5/thumbnails/6.jpg)
A bit of history● Released in 2009 after Apple introduced the 3GS with “auto-focus”
feature.
● At the time, there were several apps with “HDR” in their names but all they did was single-image contrast enhancement.
● Initially version was low-resolution (1 MP); current version supports up to 19 MP.
● Apple’s introduction of built-in HDR in 2010 didn’t kill the app. Not all HDR’s are created equal; many like our results better.
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Challenges
● Automatically aligning photos with drastically different exposures
● The merge should be as natural-looking as possible. We don’t want halo artifacts.
● Image processing can need a LOT of memory but memory is a prized resource on mobile
● Doing things fast
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The Ups and Downs of App DevelopmentHighlights● Appreciative users● Was #1 in Japan and #3 in the US, for a short time● Was inaugural member of Apple’s “App Store Hall of Fame”
Setbacks● 8-month period when updates kept getting rejected by Apple
Lessons & Anecdotes