Canon EOS-1D C EOS 1D X Instruction Manual - Page 294

R Processing RAW Images with the Camera Chromatic aberration correction When [Enable] is set, the lens' chromatic aberrations (color fringing along the subject's outline) can be corrected. If [Enable] is set, the corrected image will be displayed. If the effect is difficult to discern, press the button to magnify the image. (Press the button again to return to the normal view.) About peripheral illumination correction, distortion correction, and chromatic aberration correction To execute peripheral illumination correction, distortion correction, and chromatic aberration correction with the camera, the data of the lens used for the shot must be registered in the camera. If the lens data has not been registered in the camera, use EOS Utility (provided software, p.410) to register the lens data. Processing RAW images in the camera will not produce the same results as processing RAW images with Digital Photo Professional. 294