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 HDR format. This tool works for both professionals and casual users. Convert your images to HDR 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.
Radiance HDR
The pioneering high dynamic range format for lighting simulation.
The Radiance HDR format (often called RGBE) is a raster image format designed for storing high dynamic range (HDR) data. Rather than standard 8-bit integers, it uses a specialized encoding where pixel colors are stored as Red, Green, and Blue mantissas sharing a single common Exponent (RGBE). This allows it to represent a vast range of luminance values, from direct sunlight to deep shadows, in a relatively compact 32-bit-per-pixel format.
The .hdr format consists of a human-readable header containing variables like exposure and gamma, followed by binary pixel data. The pixel data typically uses the 'Radiance RGBE' encoding. Each pixel is 4 bytes: one byte each for Red, Green, and Blue, and one shared Exponent byte. This 'shared exponent' scheme is efficient but introduces some limitations—if one channel is very bright and another is very dark in the same pixel, color precision can be lost (color banding).
Developed by Greg Ward in the late 1980s for the Radiance lighting simulation system. It was one of the first formats to enable practical HDR storage and became a de facto standard in the CGI industry for Image-Based Lighting (IBL).
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