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XCF to PJPEG
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XCF (eXperimental Computing Facility) is the native image format of the GIMP (GNU Image Manipulation Program) software. It is a layered image format, allowing users to save their progress, layers, channels, paths, and text layers for further editing. While XCF retains all editing data and layers, it's not typically used for web or print because many other programs do not recognize it. Instead, it's primarily used to save intermediate stages of digital art or photo editing within GIMP.

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.