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The file with the .tga extension is a raster graphics format created by Truevision Inc. It was designed for the TARGA (Truevision Advanced Raster Graphics Adapter) board and provides high-color/true-color display support for IBM-compatible PCs. It supports 8, 16, 24, and 32 bits per pixel as well as 8-bit alpha channel. It also supports lossless RLE compression, which can be used to reduce image size. Digital photos and textures use the TGA image format.
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.