Canon EOS-1D X Mark II DSLR Camera (Body Only) - Manual (Page 160)

Setting the Image-Recording Quality
160
A RAW image is raw data output by the image sensor converted to
digital data. It is recorded to the card as is, and you can select the
quality as follows:
1 , 41 , or 61 .
A 1 image can be processed with [ 3 2: RAW image processing ]
(p.394) and saved as a JPEG image. ( 41 and 61 images cannot
be processed with the camera.) As the RAW image itself does not
change, you can process the RAW image to create any number of
JPEG images with various processing conditions.
You can use Digital Photo Professional (EOS software, p.552) to
process RAW images. You can make various adjustments to images
depending upon how they will be used and generate JPEG, TIFF, or
other types of images reflecting the effects of those adjustments.
RAW Images
RAW Image Processing Software
To display RAW images on a computer, using Digital Photo Professional
(DPP, EOS software) is recommended.
Previous versions of DPP Ver.4.x cannot process RAW images taken
with this camera. If a previous version of DPP Ver.4.x is installed on your
computer, update it with the EOS DIGITAL Solution Disk (p.553). (The
previous version will be overwritten.) Note that DPP Ver.3.x or earlier
cannot process RAW images taken with this camera.
Commercially-available software may not be able to display RAW
images taken with this camera. For compatibility information, contact the
software manufacturer.