Image Quality

because when I am packing the game for android he loses image quality ?

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Hi!

Not all android device can support Mobile HDR. Therefore, the sky is so different. In UE 4.8 OpenGL ES2 not support shadows for movable objects. Since version UE 4.9 you can activate Modulated Shadows for movable objects.

Graphics for Mobile has many restriction. All requirements you can find in this docs: