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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.

DNG

Digital Negative (DNG) is a raw image file format for digital photography that's open-source, royalty-free, and highly compatible. It was developed by Adobe to address the lack of an open standard for raw files from different cameras and editing software. DNG files are supported by many software manufacturers, including Apple and Google, and camera manufacturers, including Leica, Casio, Ricoh, Samsung, and Pentax. Editing: DNG files are easier to edit because changes are written directly into the file. Non-destructive editing allows you to revert to the original image data at any time. Size: DNG files are typically 15–20% smaller than RAW files. Storage: DNG files can be compressed, making them ideal for storage and archives. Future compatibility: DNG files are more likely to be openable in the future. DNG files can also be used to store metadata, such as shooting parameters, copyright, and star ratings.