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NEF to JNG
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NEF stands for Nikon Electronic Format and is Nikon's proprietary raw image file format. It stores image data exactly as it was captured by the camera’s sensor, preserving the maximum amount of information and allowing for extensive post-processing flexibility in terms of exposure, color balance, and sharpness adjustments.

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.