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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.

JPG (or JPEG) is one of the most widely used image file formats, favored for its efficient lossy compression algorithm that significantly reduces file size while maintaining a high image quality. It is commonly used for photographs and web graphics; however, the lossy nature of its compression means that some image quality is sacrificed, and this loss can be exacerbated with repeated editing and saving. JPG files support 24-bit color, allowing for a broad spectrum of colors, but they do not support transparent backgrounds.