[Blend readjusted part of picture]

Thank you!  There's a whole new world there to try!  Yes, I do have the original still -  I learned the hard way some time ago to do that...

Thanks again.

[Blend readjusted part of picture]

As a new player, I shall be grateful for any help on this problem - I've tried searching, but come up with nothing.

 

I have a picture which needed a dark corner adjusting which I've done by selecting the area in question.  Please can someone tell me if there is any way of blending this into the rest of the photo seamlessly?  At present all I can get is a new area with sharply defined borders.

 

Thank you for any help! (I tried attaching, but the file was too big).