Lg g4: problem when i lock a pictures

[AC Question]

I have a problem with my lg g4, in the gallery you can hide a pictures with a password, the problem is that when i lock a picture and i go to see it the picture is in low quality and if I unlock it it returns in his original quality (HD)

 

[Golfdriver97]

Welcome to the forums. I am taking a guess here, but I am wondering if it cuts down on the quality in order to lock the photo?