ColorControls and images

I've got a satellite pic to render which is an image. As such, the only visual scalarmap I can use is RGB. I want to display it in greyscale, but when I try to use initGreyWedge, nothing happens. I've got a code snippet below. When it executes I see the println of "Greyscale" but then there is no change.

Would you expect this to work?


Code Snippet :

        if(scalarMap != null) {
            ColorControl cc = (ColorControl) scalarMap.getControl();

            if(mode == ColorConfigurable.GREYSCALE) {

            if(mode == ColorConfigurable.RGB) {

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