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 PGX format. This tool works for both professionals and casual users. Convert your images to PGX 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 2000 VM Uncompressed
A single-component test format for JPEG 2000 verification.
PGX is an extremely simple, uncompressed raster format created specifically for the development and testing of the JPEG 2000 standard (ISO 15444). It is defined in the JPEG 2000 Verification Model (VM). Its purpose is to store a single component (channel) of an image with potentially high bit depth and signed/unsigned values, without the complexity of a full image container.
A PGX file represents one image channel (grayscale). It starts with a minimalist text header identifying the endianness (`LMS` or `Big`), the sign (`+`/`-`), the bit depth, and dimensions. The raw pixel data follows immediately. It is effectively a raw dump of a single image plane.
Developed by the JPEG committee during the creation of JPEG 2000. It allowed researchers to test wavelet compression algorithms on raw data without worrying about file headers or color transforms.
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