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PNG is a lossless compressed image file format that supports transparent backgrounds and high-resolution images. It provides high-quality images without taking up too much bandwidth, so it is widely used on the web. It contains 24-bit RGB color images, 8-bit grayscale images, and 24-bit images with alpha channels, and supports multiple color spaces, including sRGB, Adobe RGB, and grayscale. It can be created and edited in many different applications, including Adobe Photoshop, GIMP, and Microsoft Paint.
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.