HTC 10 evo features a quick way of adjusting the exposure level or brightness in real time.Turn Touch autoexposure on to automatically adjust the exposure levels  when you tap a darker area on the Viewfinder screen.
 
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		  On the 
				Home screen, tap the camera icon to open the 
				Camera app. 
			  
		
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		  Switch to 
			 Photo or Panorama mode. 
		   
		  See 
			 Choosing a capture mode for details. 
		   
		
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Tap  to open the slideout menu. to open the slideout menu.
- Tap Settings.
- Select the Touch autoexposure option.
- Tap on the subject to brighten. To manually adjust the exposure, drag your finger up and down. 
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		  When you're ready to take the photo, tap  . .