Dynapik offers a free online tool to change image types - no need to download anything. It's quick and easy to use. You can change your XCF images to JNG format. This tool works for both professionals and casual users. Convert your images to JNG in seconds.
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GIMP Image
The native project format of the GNU Image Manipulation Program.
XCF (eXperimental Computing Facility) is the native file format of the GIMP. Like Adobe's PSD, it stores all the editing data of an image project: layers, channels, paths, guides, selections, and text layers. It allows users to save their work-in-process and resume editing later non-destructively.
The format is a container for a hierarchy of image structures. Since GIMP 2.10 (2018), XCF supports high bit depth (up to 32-bit floating point) and zlib compression. Older versions were 8-bit only. Note that ImageMagick's support for XCF is often limited to flattening the image or extracting the composite preview.
Named after the XCF student group at UC Berkeley where GIMP was originally written.
JPEG Network Graphics
JPEG compression with PNG transparency.
JNG (JPEG Network Graphics) is a sub-format of the MNG animation format. It was designed to combine the high compression of JPEG with the alpha transparency features of PNG, something that standard JPEG lacks. It essentially wraps a JPEG stream and a mask channel in a chunk-based container.
A JNG file structure mimics PNG. It uses a 8-byte signature and chunks. The image data is split into a color chunk (JDAT) which contains JPEG data, and an alpha chunk (IDAT) which contains PNG-compressed alpha mask. This allows for 'lossy color, lossless alpha' images, which is very space-efficient for photographic sprites.
Created by the PNG Development Group around 2001 as part of the MNG (Multiple-image Network Graphics) project. It failed to gain traction as MNG was rejected by Mozilla and Chromium in favor of APNG and later WebP.
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