Canon EOS-1D X Mark III Advanced User's Manual page 166

RAW Images
RAW images are raw data from the image sensor that are recorded to the card digitally as
or , based on your selection.
sizes than .
RAW images can be processed using [
JPEG or HEIF images. As the RAW image itself does not change, you can process the
RAW image to create any number of JPEG or HEIF images with various processing
conditions.
You can use Digital Photo Professional (EOS software) to process RAW images. You can
make various adjustments to images depending upon how they will be used and can
generate JPEG, HEIF, or other types of images reflecting the effects of those adjustments.
Note
To display RAW images on a computer, using Digital Photo Professional (EOS
software, hereafter DPP) is recommended.
Older versions of DPP Ver. 4.x do not support display, processing, editing, or other
operations with RAW images captured by this camera. If a previous version of DPP
Ver. 4.x is installed on your computer, obtain and install the latest version of DPP
from the Canon website to update it (
Similarly, DPP Ver. 3.x or earlier does not support display, processing, editing, or
other operations with RAW images captured by this camera.
Commercially available software may not be able to display RAW images captured
by this camera. For compatibility information, contact the software manufacturer.
produces RAW images with smaller file
: RAW image processing] (
), which will overwrite the previous version.
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) to save them as