This is a demonstration of the fact that dynamic range and noise are opposites, in fact dynamic range is usually defined in terms of the noise floor of an image. The result looks similar but with much more noise in the shadows:ĭisclaimer: for the love of God don't do this to your images! The reason that tonemapping is not HDR is that you can tonemap a single low dynamic range image in order to make it more contrasty. What tonemapping does is instead of mapping the whole image into the monitor's brightness range in one go, it adjusts the contrast locally so that each region of the image uses the whole range for maximum contrast (there's a bit more going on here, it depends on the tonemapping algorithm used). It would be great if we could combine them in some way, or carefully ration out the brightness range we have to work with so we make most use of it. Likewise if you used all the monitors brightness range for the subject it would also look good, but we'd totally lose the sky: This image has a split personality, the skies are very bright and the subject much dimmer, if we could use all the monitor's brightness range for the sky, it would look pretty good:īut we'd totally lose our subject. This results in an overall lack of contrast, hence the flatness. This is because that huge range of brightnesses has to be compressed to fit into a much smaller range of brightnesses. An HDR image on a normal (low dynamic range) monitor will actually look very flat: ![]() An HDR image has a high dynamic range, which means a very large ratio between the brightest and darkest parts of the image.
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