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DNG (Digital Negative) is an open-source raw image file format developed by Adobe, aimed at providing a universal and more standardized option for storing raw image data from digital cameras. This format enables extensive post-processing flexibility, allowing photographers to adjust exposure, color balance, and other settings while preserving image quality. DNG files also tend to be smaller in size compared to other raw formats, and they are widely supported across various software applications, making them a popular choice for photographers looking for both quality and compatibility.

PJPEG (Joint Photographic Experts Group) is a widely used method of lossy compression for digital images. It is particularly well-suited for photographs and realistic paintings, and it works by reducing image file size with a slight sacrifice in quality. The amount of compression can be adjusted, allowing for a trade-off between storage size and image quality.