<fxlayout></fxlayout>

  <page name="Adjust Levels"></page>

<separator label="RGB"></separator>

    <control>in_rgb</control>

    <control>out_rgb</control>

<separator label="Red"></separator>

    <control>in_r</control>

    <control>out_r</control>

<separator label="Green"></separator>

    <control>in_g</control>

    <control>out_g</control>

<separator label="Blue"></separator>

    <control>in_b</control>

    <control>out_b</control>

<separator label="Alpha"></separator>

    <control>in_m</control>

    <control>out_m</control>

  <page name="Gamma"></page>

    <histogram></histogram>

    <control>gamma_rgb</control>

    <control>gamma_r</control>

    <control>gamma_g</control>

    <control>gamma_b</control>

    <control>gamma_m</control>