# LuaScript

The Lua script that returns the rotation to apply to the input image, in degrees, clockwise.

Specify one of the following:

- the absolute path to the Lua script file.
- the path to the Lua script file, relative to the LuaDirectory.
- a string that matches one of your `AdditionalDataLabels`, (if you use the `AdditionalData` and `AdditionalDataLabels` action parameters to upload the Lua script file as part of the Process action).

TIP: If your script is relatively short, for example a single line, you can set the parameter `LuaLine` instead of `LuaScript`. The `LuaLine` parameter allows you to specify a small amount of Lua code directly in the configuration file, removing the need for a separate script file.

The Lua script must define a function named `getAngle`, which must return the angle. Media Server can rotate images in 90-degree increments, so all other angles are rounded.

The following is an example Lua script that you could use to rotate images based on the angle of a face detected in the image, or text detected in the image. In this example, the angles returned are negative, so the rotation is anticlockwise.

    function getAngle(record)
      if (record.OCRResultAndImage) then
         return -record.OCRResultAndImage.angle
      elseif (record.FaceResultAndImage) then
         return -record.FaceResultAndImage.face.ellipse.angle
      elseif (record.FaceRecognitionResultAndImage) then
         return -record.FaceRecognitionResultAndImage.face.ellipse.angle
      elseif (record.DemographicsResultAndImage) then
         return -record.DemographicsResultAndImage.face.ellipse.angle
      elseif (record.FaceStateResultAndImage) then
         return -record.FaceStateResultAndImage.face.ellipse.angle
      end

      return 0
    end

Type: | String
Default: |
Required: | Required unless you set Angle
Configuration Section: | TaskName
Example: | `LuaScript=rotate.lua`
See Also: | Angle

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