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High-Dynamic Range image (High-Dynamic Range, referred to as HDR), compared to ordinary images, can provide more dynamic range and image details. According to LDR (Low-Dynamic Range) images with different exposure times, use Each exposure time corresponds to the best detail LDR image to synthesize the final HDR image, which can better reflect the visual effect in the real environment.
OpenEXR is an HDR standard developed by Industrial Light & Magic. OpenEXR file extension is .exr, the common OpenEXR file is FP16 (16bit Float Point, also known as half Float Point) data image file, the data type of each channel is FP16, a total of four channels 64bpp, each channel 1 bit bit is used to mark the "index", 5 bits are used to store the value of the index, 10 bits are used to store the mantissa of the chromaticity coordinates (u, v), and its dynamic range is from 6.14 × 10 ^ -5 to 6.41 × 10 ^ 4.