/usr/share/kdenlive/effects/frei0r_brightness.xml is in kdenlive-data 16.12.2-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 | <!DOCTYPE kpartgui>
<effect tag="frei0r.brightness" id="frei0r.brightness">
<name>Brightness</name>
<description>Adjusts the brightness of a source image</description>
<author>Jean-Sebastien Senecal</author>
<parameter type="constant" name="Brightness" default="500" min="0" max="1000" factor="1000">
<name>Brightness</name>
</parameter>
</effect>
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