How to properly prepare 2d graphics for export to Unity3d?

Question

Graphic arts

Hello! Tell me the manual for the correct preparation of 2D graphics for export from Photoshop to Unity.
Which format is right to choose, is it necessary to optimize the image (tinypng, imageoptim and the like)?
The question is in order to reduce the size of the game build and reduce the load on the CPU and eat up the RAM of the mobile phone and tablet.

Answer 1

Compression will be handled by Unity itself. All this can be done in the import twists . There it is worth paying attention to the fact that with some settings, the texture size should be a power of two (4x4, 8x4, 16x16, etc.), but not always.
It will be most convenient to work directly with the .psd sources, at the maximum resolution (as far as it is implied in the art itself).