What is a Digital Negative

We see various types of camera media come into us for data recovery, with surprisingly varied file formats. Many camera manufacturers use their own raw format, alongside various JPG options.

This raw format is sometimes known as a digital negative, containing (mostly) untouched data straight from the camera. These raw format images can be ten times the size of JPG images.

The benefits of raw files are to allow post-processing without the loss of quality from JPG files. Settings like sharpness, saturation and white balance can be changed at a later date using photographic software. Below are a few of the different raw file types in use.

The following is a description about some RAW formats:

  • CRW – Canon Digital Camera Raw Image Format. Raw image format for some Canon digital cameras. Raw images are basically the data as it comes directly from the CCD detector in the camera. Raw files can also contain text information about the picture and conditions in the camera when the picture was taken.
  • CR2 – Canon Digital Camera Raw Image Format version 2.0. Raw files can also contain text information about the picture and conditions in the camera when the picture was taken. These images are based on the TIFF image standard.
  • NEF – Nikon Digital SLR Camera Raw Image File. Raw image format for some Nikon digital cameras.
  • RAF – Fuji CCD-RAW Graphic File. Exif (Exchangeable Image File) information is within the file along with the image.
  • X3F – Sigma Camera RAW Picture File. Use the SIGMA Photo Pro software provided with the camera to download and manipulate the photos. The Foveon X3 direct image sensor captures all three colors at every pixel location and requires special software to manipulate the RAW files.
  • BAY – Kodak/Roper Bayer Picture Sequence. A specific Kodak picture format used by some high speed video cameras such as Kodak HRC-1000.
  • ORF – Descent 3 Outrage Room Format.
  • MRW – Minolta Diamage Raw Image File. Raw image format for some Minolta digital cameras.
  • RAW – Image Alchemy HSI Temporary Raw Bitmap
  • SRF – Sony DSC-F828 Raw Image File. CCD-Sensor RAW Data File from Sony DSC-F828 8 megapixel digital camera.

 

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