private void verifyDefaults(PosterizationFilter filter) {
        Assert.assertEquals(0.6f, filter.getGamma(), 0f);
        Assert.assertEquals(8, filter.getNumColors(), 0f);
        Assert.assertEquals(1f, filter.getStrength(), 0f);
        Assert.assertTrue(filter.isEnabled());
    }
Verify some default values of a newly instantiated
{@code PosterizationFilter}.

@param filter (not null, unaffected)
jme3-effects/src/test/java/com/jme3/post/filters/PosterizationFilterTest.java