Mouse over the local picture to brighten, other places the image dimmed effect

A long time did not do, the principle is a little forgotten.

The principle of the effect

The principle is actually very simple, first give a black background, by reducing the transparency of the picture, let the black background appear, the picture looks darker. Move the mouse to the picture 1, then let the other pictures in addition to the image 1 of the transparency of the lower, so that they look darker, so that the picture 1 appears brighter

Js. Css. JQ can be used

Here's the principle of recording:

Mouse over the local picture to brighten, other places the image dimmed effect