@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        final InputCapsule inputCapsule = im.getCapsule(this);
        redExponent = inputCapsule.readFloat("redExponent", 1f);
        greenExponent = inputCapsule.readFloat("greenExponent", 1f);
        blueExponent = inputCapsule.readFloat("blueExponent", 1f);
        lowerLimit = inputCapsule.readFloat("lowerLimit", 0f);
        upperLimit = inputCapsule.readFloat("upperLimit", 1f);
        redScale = inputCapsule.readFloat("redScale", 1f);
        greenScale = inputCapsule.readFloat("greenScale", 1f);
        blueScale = inputCapsule.readFloat("blueScale", 1f);
    }
De-serializes this filter, for example when loading from a J3O file.

@param im the importer to use (not null)
@throws IOException from the importer
jme3-effects/src/main/java/com/jme3/post/filters/ContrastAdjustmentFilter.java