ofxHueShader

how to use

	ofxHueShader::beginShader(hue, aplha);
			tex.draw(0, 0);
	ofxHueShader::endShader();
	
	or
	
	ofxHueShader hueShader;		
	hueShader.begin(hue, alpha);
			tex.draw(0, 0);
	hueShader.end();