About the (frightful) vertical img centering

This is a pretty easy task, but I need to find the correct syntax EVERY TIME.
The trick is to give an height to the container then use the vertical-align property.

Here’s the HTML:

  
  some text

Here’s the CSS:

.container {
  background-color: rgba(0, 0, 0, 0.5);
  width: 200px;
  height: 130px; /* needed */
  line-height: 130px; /* needed */
}

.container img {
  vertical-align: middle; /* needed */
}