commander>Retinex-Filter
   macro>
    comment>Add a new Retinex layer and apply the retinex filter with default settings
    >>>RetinexLayer = pdb.gimp_layer_new_from_visible(theImage, theImage, "Retinex")
    >>>theImage.add_layer(RetinexLayer,0)
    comment>Retinex parameters - Scale = 240; ScaleDiv = 3; Level = 0; Dynamic = 1.2
    >>>pdb.plug_in_retinex(theImage, RetinexLayer, 240, 3, 0, 1.2)

    comment>Make the retinex layer B&W - retinex distorts color
    >>>pdb.gimp_desaturate_full(RetinexLayer, 1)
    >>>RetinexLayer.mode = OVERLAY_MODE
    >>>RetinexLayer.opacity = 75.0
    comment>Adjust the opacity based on Property EnhanceContrastLevel
    >>>ContrastLevel = str(theImage.parasite_find('EnhanceContrastLevel'))
    >>>if (ContrastLevel == 'EXTRA'): RetinexLayer.opacity = 100.0
    >>>if (ContrastLevel == 'NORMAL'): RetinexLayer.opacity = 75.0
    >>>if (ContrastLevel == 'MID'): RetinexLayer.opacity = 50.0
    >>>if (ContrastLevel == 'NONE'): RetinexLayer.opacity = 0.0