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JNG (JPEG Network Graphics) is an image file format similar to PNG, but it uses JPEG compression for bitmaps and offers support for color and grayscale images with or without transparency. This format was designed to provide a simpler, more efficient method for transmitting images over the internet, and it allows for lossy compression to reduce file size without a significant loss in quality for certain types of images. However, JNG is not as widely supported as other more common image formats like JPEG and PNG.

The "JPE" file extension is a less common extension used for JPEG (Joint Photographic Experts Group) images. JPEG is a widely used image format known for its lossy compression, which significantly reduces file sizes while maintaining a high level of image quality, making it popular for photographs and web images. The "JPE" extension functions the same as the more common ".jpg" or ".jpeg" extensions, and it can be opened and edited with most image viewing and editing software. The reason for the different extensions simply comes down to historical variations and software preferences, and they all represent the same JPEG image format.