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Constellation

Resolution for art mode pictures

I've recently purchased the 49" Frame TV (2018 model, not the newer QLED model).

 

I'm trying to use my own pictures in art mode, but can't work out what size I need to make them to properly fill the screen. 

 

I believe the screen has a 16:9 aspect ratio, and the publicised spec suggests the resolution is 3840 x 2160.

 

However, if I size my images to 3840 X 2160 in Photoshop and then send them to the TV with the Smartthings app they display with a black bar at the top and bottom.

 

What am I doing wrong? Any help gratefully received.

 

Many thanks.