@Override
    public void read(JmeImporter im) throws IOException {
        super.read(im);
        InputCapsule ic = im.getCapsule(this);
        glowMode = ic.readEnum("glowMode", GlowMode.class, GlowMode.Scene);
        blurScale = ic.readFloat("blurScale", 1.5f);
        exposurePower = ic.readFloat("exposurePower", 5.0f);
        exposureCutOff = ic.readFloat("exposureCutOff", 0.0f);
        bloomIntensity = ic.readFloat("bloomIntensity", 2.0f);
        downSamplingFactor = ic.readFloat("downSamplingFactor", 1);
    }
Sets the downSampling factor : the size of the computed texture will be divided by this factor. default is 1 for no downsampling
A 2 value is a good way of widening the blur

@param downSamplingFactor the desired factor (default=1)
jme3-effects/src/main/java/com/jme3/post/filters/BloomFilter.java