Mirroring RGB image [closed]

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Hi, i'd like to know how image mirroring works. My launch file is this:

<launch>
<include file="$(find openni_camera)/launch/openni_node.launch"/>
<remap from="video" to="/camera/rgb/image_color"/>
<node pkg="merge" name="faces_detection" type="detection" respawn="true" output="screen"/>
<node pkg="dynamic_reconfigure" type="dynparam" name="ressetter" args="set /openni_camera point_cloud_resolution 0" />
<remap from="points" to="/camera/depth/points"/>
<node pkg="merge" type="people_viewer" name="people_viewer"  output="screen" respawn="true" />
</launch>

I have two viewer: the first show RGB video (it obtain images using rgb transporter), the second is a depth viewer that show points using PCL library. I don't know why RGB images are mirrored and depth no. How can i change this settings?