What is X3F?
An X3F file is a saved RAW file in SIGMA format; s X3F, a high-end digital photo format-final also known as Foveon X3 or FOVb format. It stores data for a single captured image with a digital camera. The X3F files support data, images, thumbnails, images, preview and information about the properties of the text.
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X3F file type.