This page contains information on the X3F file extension (Sigma Camera RAW Picture File), a popular video file format

X3F X3F (Image)

File extension .x3f
Category Image File
Description X3F is a proprietary RAW image format produced by the camera manufacturer Sigma in conjunction with Foveon Inc. Sigma cameras capture raw information straight from the camera's Foveon sensors when taking a shot which means photos can be captured with the conditions in which they were taken. The Sigma X3F format contains all the information necessary to allow photographers to make final adjustments before exporting the image to a more common format such as JPG or TIFF.
Technical Details X3F files are designed to hold all the data associated with a single image, including the image data, thumbnail(s), preview image(s) and text properties. The X3F format is designed to allow modification of file data by appending subsequent information to the file - this allows the file format to be used on write-once media, where earlier data in the file cannot be changed. In the X3F format brightness and color data is kept in a 1:1 ratio without relying on interpolation. X3F files begin Files begin with ASCII signature "FOVb".
Associated programs
  • Adobe Photoshop
  • Corel Draw
  • Google Picasa
Developed by Sigma & Foveon Inc.
MIME type
  • image/x-sigma-x3f
Useful links

X3F Convert X3F file

Using Zamzar, it is possible to convert X3F files to a variety of other formats

  • x3f to ai (Adobe Illustrator Artwork)
  • x3f to bmp (Windows bitmap)
  • x3f to eps (Encapsulated PostScript)
  • x3f to gif (Compuserve graphics interchange)
  • x3f to jpg (JPEG compliant image)
  • x3f to pcx (Paintbrush Bitmap Image)
  • x3f to pdf (Portable Document Format)
  • x3f to png (Portable Network Graphic)
  • x3f to tga (Truevision Targa Graphic)
  • x3f to tiff (Tagged image file format)
  • x3f to wbmp (Wireless Bitmap File Format)
  • x3f to webp (Lossily compressed image file)
X3F Converter Image