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 pleasant image.
You can also change the settings of the image shot with the camera’s
Auto Lighting Optimizer function.
This function is compatible only with RAW images shot with EOS-1D X,
EOS-1D C, EOS-1D Mark IV, EOS 5D Mark III, EOS 5D Mark II, EOS
6D, EOS 7D, EOS 70D, EOS 60D, EOS 50D, EOS REBEL T5i/700D,
EOS REBEL SL1/100D, EOS REBEL T4i/650D, EOS REBEL T3i/600D,
EOS REBEL T2i/550D, EOS REBEL T1i/500D, EOS REBEL T5/1200D,
EOS REBEL T3/1100D, EOS M2 and EOS M.
* ALO stands for Auto Lighting Optimizer.

Select the [NR/ALO] tab sheet from the tool palette in
the edit window or edit image window.

Checkmark the checkbox.



For images shot with the camera’s Auto Lighting Optimizer
function, the checkbox is already checked.

Change the settings according to your preferences.



Auto correction is applied to the image to match the settings.



For images shot with the camera’s Auto Lighting Optimizer
function, the settings at the time of shooting are applied as the
default values.



To cancel the Auto Lighting Optimizer, remove the check mark
from the checkbox.

Checkmark

Select from three levels:
Low/Standard/Strong



When [Highlight tone priority] is set to [Enable] in EOS-1D X,
EOS-1D C, EOS 5D Mark III, EOS 6D, EOS 7D, EOS 70D, EOS
60D, EOS REBEL T5i/700D, EOS REBEL SL1/100D, EOS
REBEL T4i/650D, EOS REBEL T3i/600D, EOS REBEL T2i/550D,
EOS REBEL T5/1200D, EOS REBEL T3/1100D, EOS M2 and
EOS M, the Auto Lighting Optimizer function cannot be set.



You cannot use the Auto Lighting Optimizer with multiple-
exposure RAW images created on the camera.

Using the Auto Lighting Optimizer

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