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JFIF

The JPEG File Interchange Format (JFIF) is an image file format standard published as ITU-T Recommendation T.871 and ISO/IEC 10918-5. It defines supplementary specifications for the container format that contains the image data encoded with the JPEG algorithm. The base specifications for a JPEG container format are defined in Annex B of the JPEG standard, known as JPEG Interchange Format (JIF). JFIF builds over JIF to solve some of JIF's limitations, including unnecessary complexity, component sample registration, resolution, aspect ratio, and color space. Because JFIF is not the original JPG standard, one might expect another MIME type. However, it is still registered as image/jpeg.

HEIF

HEIF stands for High Efficiency Image File Format, and is a file type that stores images and other media in a compact, high-quality way. HEIF uses the High Efficiency Video Coding (HEVC) compression algorithm to reduce file sizes without sacrificing image quality. HEIF files can contain multiple images, image sequences, and additional data like depth maps and thumbnails.