hello.. i have samsung galaxy j7 .. the camera is quite good but somtimes at night when i use flash the pics come with a l

If the phone is newer (and still under warranty) I would suggest contacting your carrier or the manufacturer as it may be a defect.

If it isn't under warranty, I would ask if it has been dropped, hit, banged, sat on, etc. Why? Because it sounds like some of the flash's light is leaking through to the camera.
 
The phone is not in warranty... but it doesnt dropped or banged.. if u take a picture somtimes it happen. Not every time. After restarting the mobile again. The camera performs absolutly awsome.. it may be a software problem. What do u think now?
 
It seems odd to be a software problem, unless the exposure is being altered by the software. A good test would be to try a different way of taking pictures, through an app other than the standard one that comes with the phone, and see if the same problem occurs.