# Overlay Transformation Engine

The overlay transformation engine draws an overlay that can contain lines and shapes. The overlay shows information extracted by Media Server. For example, you can draw an outline around each detected face. When you encode a video, Media Server can add the overlay, so that you can show and hide it when the video is played in the Micro Focus Media Player.

Configuration Parameter | Description
--- | ---
Color | The line color to use when drawing.
Input | The name of the track that contains the metadata to use to draw the overlay.
LuaScript | A Lua script to run to draw the overlay.
Thickness | The line thickness to use when drawing.
Type | The type of transformation engine to use. Set this parameter to `Overlay`.

This transformation engine produces a single output track, named `taskName.Output`, where `taskName` is the name of the transformation task.

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