Sun raster .sun
A raster format used by Sun workstations, also commonly saved with the RAS extension.
SUN and RAS are extension variants; output is a raster image.
SUN file format guideSUN to HDR converter
Convert Sun raster (.sun) to HDR for free. Choose files, review the available settings and download your results. No account needed.
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Radiance HDR .hdr
An RGBE raster format that represents a wider brightness range than ordinary display images.
Exports contain a flattened raster image. Editing uses 8-bit browser display precision; original layers, metadata, HDR range, and scientific sample values are not retained.
HDR file format guideHow to convert SUN to HDR
- Select SUN files from your device or drag them into the converter.
- Check the HDR output. Open conversion settings if you want to make adjustments.
- Convert, compare the original and result, then download your files.
Quality, compatibility and file limits
Choose dimensions and image quality before converting. Still-image exports keep one frame. Unedited GIF, WebP, AVIF, JPEG XL and MNG conversions can retain animation. Animated edits use a GIF intermediate with a limited color palette. Canvas editing uses browser display precision and does not preserve original EXIF, HDR, or scientific image data.
Processing uses your device when possible and our servers when required. Browser files are limited to 256 MB each; server conversions to 64 MB; browser spreadsheets to 32 MB. Previews show supported content and do not guarantee identical rendering in every application.