![]() However, the results will be different on other devices: If it is displayed on a television with 0-2000 Nits range, the brightness range will be exactly as shot in the raw footage. Let’s say an image is shot with peak brightness of 2000 Nits. Tone mapping performs an appropriate brightness mapping of the content to device without significant degradation. Source footage can be shot at HDR with best of cameras and then mastered on high-end HDR mastering systems, but it still need to be displayed optimally on the range of HDR televisions available in the market. Since the tone mapping is done based on the meta-data in the video stream, presence of correct meta-data is necessary. ‘brightness’) range, correct tone mapping is necessary for a good user experience. Since a broad range of HDR display devices are available in the market, each with their own Nits (i.e. This process is not simply applying the EOTF (Electro-Optical Transfer Function) on the image data but it is rather trying to map the image data with the display device capabilities using meta-data information. Tone mapping is the process of adapting digital signals to appropriate light levels based on the HDR meta-data. This article discusses how the same HDR image can be displayed differently by different HDR devices. In the previous article – HDR Transfer Functions, we discussed the transfer functions and how digital images are converted to light levels for display.
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