There is a cool site which has a few examples of this effect - http://depthy.me/
Basically you only need a source image and a depthmap image
Depthmap image consists of various shades of gray. Darker - the object is closer to the viewer, brighter - it's deeper in the background
You can make a depthmap even in ms paint, so this is a very user-friendly way of customizing how the game looks
![](https://i.ppy.sh/41ff6974bdf8354cbf2fbe0e3af6f03b7a20c189/687474703a2f2f7075752e73682f6576727a312f366264303238336639622e6a7067)
Title screen is the best place to use this
Basically you only need a source image and a depthmap image
Depthmap image consists of various shades of gray. Darker - the object is closer to the viewer, brighter - it's deeper in the background
You can make a depthmap even in ms paint, so this is a very user-friendly way of customizing how the game looks
Title screen is the best place to use this