Spectrum plot feedback

Hi All,
Is this possible for blurring a spectrum plot? I wanted to add a form of image feedback. Could I use the ScopedSaveState?

void paint (Graphics& g) override
        spectrumFeedBack.multiplyAllAlphas (0.5f);
        g.drawImageAt(spectrumFeedBack, 0, 0, false);
//other drawing code here
void timerCallback() override
       if ( processor.checkForNewData() )
 //set the spectrum plot from the processor
            repaint ();
            spectrumFeedBack =  createComponentSnapshot (getLocalBounds(), false);
    Image spectrumFeedBack;

Thank you all