Canon EOS-1D X Mark III Advanced User's Manual page 945

Recording system
Recording format
Image type
Pixels recorded
Recording features
Folder creation and selection
File naming
File numbering
DCF 2.0
JPEG (8-bit), HEIF (10-bit), RAW (14-bit Canon original)
RAW+JPEG simultaneous recording possible
RAW+HEIF simultaneous recording possible
* 12 bit A/D conversion processing is applied for RAW images shot with the electronic
shutter.
Image Quality
L
M1
JPEG
M2
S
HEIF L
RAW RAW/C-RAW
* Rounded to the nearest 100,000.
Still photo/movie separate, Still photo recording options, Movie recording
options, Still photo record/play, Movie record/play
Available
Preset code, User Defined 1, User Defined 2
Continuous, Auto reset, Manual reset
945
Pixel Count
Approx. 20.0 megapixels (5472×3648)
Approx. 12.7 megapixels (4368×2912)
Approx. 8.9 megapixels (3648×2432)
Approx. 5.0 megapixels (2736×1824)
Approx. 20.0 megapixels (5472×3648)
Approx. 20.0 megapixels (5472×3648)