Wallpaper pixelating on display, SONY XA

[cupcake55]

 Good day to all!

I love my Sony XA, but he have little problem: when I put the desktop wallpapers on the background (even if the quality of the picture is super good), they become pixelated

Sorry, if same question has already been asked, but I'm counting on your help!

Thanks again

[Uliwooly]

@cupcake55

which are the steps that you follow to set the wallpaper? 

[cupcake55]

I downloaded the gallery program from the Play Market, then set the photo on wallpaper. That's all. 

Program named Foto Gallery, I'm loving it

wallpaper pixelated, when i set it from any program