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I found the problem: Ptam only accepts monochrome images so i used "image_proc" to convert it. My launch file looks like this now:

<launch>
    <group name="cam_ptam">
        <node name="usb_cam" pkg="usb_cam" type="usb_cam_node" />

        <node name="image_proc" pkg="image_proc" type="image_proc">
            <remap from="image_raw" to="usb_cam/image_raw" />
            <remap from="camera_info" to="usb_cam/camera_info" />
        </node>

        <node name="ptam" pkg="ptam" type="ptam" clear_params="true" output="screen">
            <remap from="image" to="image_mono" />
            <remap from="pose" to="pose"/>
            <rosparam file="$(find ptam)/PtamFixParams.yaml"/>
        </node>
    </group>
</launch>