Canon EOS-1D X Mark III EOS-1DX Mark III Advanced User Guide - Page 483

Caution Processing RAW images in the camera will not produce exactly the same results as processing RAW images with Digital Photo Professional (EOS software). If you perform [Brightness adjustment], noise, banding, etc. may be intensified with the effects of adjustment. When [Digital Lens Optimizer] is set, noise may be intensified together with the effects of correction. When [Digital Lens Optimizer] is set, image edges may be emphasized, under some shooting conditions. Adjust sharpness of the Picture Style as needed. Processing with [Digital Lens Optimizer] set to [High] may take some time. Dust Delete Data ( ) is not added to images when processing is performed with [Distortion correction] set to [Enable]. Note Lens correction data for lenses compatible with this feature is registered (stored) on the camera. Effects of lens aberration correction vary by lens and shooting conditions. Also, the effect may be difficult to discern depending on the lens used, shooting conditions, etc. For details on the correction data used with Digital Lens Optimizer, see Digital Lens Optimizer. RAW movies cannot be processed. Process them with Digital Photo Professional (EOS software). 483