Convert Sigma/Foveon RAW (.x3f) to Portable Network Graphics (.png) online for free. Fast, secure image conversion with no watermarks or registration.
Upload your .x3f file by dragging it into the upload area or clicking to browse.
Choose your output settings. The default settings work great for most files.
Click Convert and download your .png file when it's ready.
PNG provides lossless compression that perfectly preserves the Foveon X3 sensor's unique per-pixel RGB output. Unlike Bayer sensors that require demosaicing interpolation, every pixel in a Foveon image contains genuine measured RGB values from three stacked silicon layers. PNG captures this extraordinary data with mathematical precision — no compression artifacts, no interpolation, no quality compromise.
For Sigma SD and DP series photographers, PNG is arguably the most important output format. It preserves the complete Foveon advantage — the per-pixel sharpness, the accurate color at every photosite — in a universally supported format with efficient lossless compression.
PNG combines lossless quality with practical file sizes and universal platform support. For Foveon photography — where per-pixel quality is the entire point — any lossy compression sacrifices part of the sensor's unique value proposition. PNG preserves 100% of the Foveon quality.
Given X3F's severe third-party compatibility limitations, PNG provides the ideal lossless escape format. The resulting files are viewable on any device, editable in any software, and preserve every bit of the Foveon's distinctive resolving power. No Sigma Photo Pro dependency required.
The conversion decodes the X3F Foveon layer data through color separation, producing true-RGB output. This is encoded with PNG's DEFLATE lossless compression at 8-bit or 16-bit depth. A 15.3 MP SD1 Merrill at 8-bit produces PNG files of approximately 20-30 MB (vs 44 MB uncompressed BMP). 16-bit PNG doubles these sizes but preserves maximum tonal range. ICC profiles can be embedded.
PNG is mathematically lossless — decompressed pixels are bit-for-bit identical to the Foveon color separation output. The per-pixel RGB sharpness, the accurate color at every photosite, and the three-dimensional rendering are all preserved exactly. For Foveon images where per-pixel quality is the defining characteristic, PNG is the format that preserves the complete advantage.
| Device | X3F | PNG |
|---|---|---|
| Windows PC | Partial | Native |
| macOS | Partial | Native |
| iPhone/iPad | Partial | Native |
| Android | Partial | Native |
| Linux | Partial | Native |
| Web Browser | No |
X3F to PNG is the ideal lossless format for Foveon photography. It preserves the complete per-pixel RGB advantage in a universally compatible format, freeing exceptional Sigma camera output from X3F's compatibility constraints.
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| Native |
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| Funktion | X3F | PNG |
|---|---|---|
| Fulde navn | Sigma RAW (Foveon) | Portable Network Graphics |
| Filendelse | .x3f | .png |
| Bedst til | Sigma cameras | Lossless quality |