Canon A3400 IS 6186B011 User Manual (en)

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Image Brightness (Exposure Compensation)
94
Before shooting, excessively bright or dark image areas (such as faces or 
backgrounds) can be detected and automatically adjusted to the optimal 
brightness. Insufficient overall image contrast can also be automatically 
corrected before shooting to make subjects stand out better.
z
Press the 
n button, choose [i-Contrast] 
on the 
4 tab, and then choose [Auto] (p. 51).
X
Once the setting is complete, 
@ is displayed.
Correcting Image Brightness (i-Contrast)
Still Images
Under some shooting conditions, correction may be inaccurate or 
may cause images to appear grainy.
You can also correct existing images (p. 125).