Add Khan20 tone mapping plugin #149
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This commit implements a tone mapping algorithm introduced in "Tone-Mapping Using Perceptual-Quantizer and Image Histogram" paper by Ishtiaq Rasool Khan, Wajid Aziz, and Seong-o. Shim. The only thing that wasn't properly discussed in the paper was how to apply the new luminance values into some color model, so I converted the input image into Yxy color space and replaced the luminance with new values to get the output image.
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This commit implements a tone mapping algorithm introduced in "Tone-Mapping Using Perceptual-Quantizer and Image Histogram" paper by Ishtiaq Rasool Khan, Wajid Aziz, and Seong-o. Shim.
The only thing that wasn't properly discussed in the paper was how to apply the new luminance values into some color model, so I converted the input image into Yxy color space and replaced the luminance with new values to get the output image.