Canon EOS-1D X Manual (en)

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If the shooting result is dark or the contrast is low, you can use the Auto 
Lighting Optimizer function to auto-correct the brightness and contrast, 
and obtain a more favorable image.
You can also change the setting of the image shot with the camera’s 
Auto Lighting Optimizer function.
This function also can be used for JPEG/TIFF images in addition to 
RAW images.
* ALO stands for Auto Lighting Optimizer.
1
Checkmark the [Auto Lighting Optimizer] checkbox.
For the image shot with the camera’s Auto Lighting Optimizer 
function, the checkbox is already checked.
2
Change the setting according to your preferences.
Auto correction is applied to the image to match the setting.
For the image shot with the camera’s Auto Lighting Optimizer 
function, the setting at the time of shooting is applied as the 
default value.
To cancel the Auto Lighting Optimizer, remove the check mark 
from the checkbox.
Using the Auto Lighting Optimizer
Checkmark
Select from three 
levels: Low/Standard/
Strong
When [Highlight tone priority] is set to [Enable] on any supported 
EOS DIGITAL camera other than the EOS-1D Mark IV, EOS 5D 
Mark II, or EOS REBEL T2i/550D, the Auto Lighting Optimizer 
cannot be used for RAW images.
You cannot use the Auto Lighting Optimizer with multiple-
exposure RAW images created with the camera.
When you apply Auto Lighting Optimizer to the RAW and JPEG 
images shot simultaneously, the correction results of the two 
images may differ.