Canon EOS 5D Mark IV L-series Zoom Lens Kit Owner's Manual

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 Processing RAW Images with the CameraN
 Chromatic aberration correction 
Chromatic aberrations (color fringing along the subject’s outline) 
due to the lens characteristics can be corrected. If [Enable] is set, 
the corrected image will be displayed. If the effect is difficult to 
discern, magnify the image (p.448).
 Diffraction correction 
The diffraction by the lens aperture degrading the image 
sharpness can be corrected. If [Enable] is set, the corrected 
image will be displayed. If the effect is difficult to discern, magnify 
the image (p.448).
 
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 with the 
effects of correction. Also, depending on the shooting conditions, 
stronger application of outline emphasis may result. If necessary, adjust 
the Picture Style’s Sharpness.
 
When processing images with [Distortion correction] set to [Enable], 
AF point display information (p.402) or Dust Delete Data (p.460) will not 
be appended to the image.
 
The lens correction data for lens aberration corrections is registered 
(stored) in the camera.
 
The effect of the lens aberration correction varies depending on the lens 
used and shooting conditions. Also, the effect may be difficult to discern 
depending on the lens used, shooting conditions, etc.
 
See page 211 regarding the correction data for Digital Lens Optimizer.