Tone-mapping HDR photos with Qtpfsgui
A lot of photos tagged with "HDR" turn up on Flickr and similar photo sharing sites these days. They're unnatural, surreal, sometimes crazy-looking images with the bright areas darkened, the dark areas brightened, and lots of saturation. You can get in on the craze under Linux using Qtpfsgui.
HDR stands for high dynamic range, and in reference to this particular look it's a misnomer -- all Flickr photos are standard, low dynamic range JPEGs. Use of the term HDR in this context stems from the fact that the technique generally begins with multiple low dynamic range shots of the same scene taken at different exposures. The shots are stacked together to mimic the effect of an HDR original. The stack of images is then tone-mapped, pulling in shadow detail from the darkest exposure and highlight detail from the brightest. It's that tone-mapping step that gives these images their distinctive appearance.
When the original scene has too much dynamic range to be properly exposed, bracketing and tone-mapping is a straightforward way to save it. Take the window scene in figure 1, for example. It has a serious technical problem: the sunlight outside the window is so much brighter than the room light inside that no exposure will capture both correctly.
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