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The main differences between DNG and PNG file formats are that DNG is primarily used for raw image files and preserves more metadata, while PNG is a lossless compression format commonly used for web graphics. DNG is more suitable for preserving image quality and metadata due to its support for raw image data and extensive metadata storage capabilities.

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Q: What are the differences between DNG and PNG file formats, and which one is more suitable for preserving image quality and metadata?
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