void Layer::MakeLayerAsThread(Layer* pLayer,double op,void* pMain,int n)
{
	ImageMT* ptr = (ImageMT*)pMain;

	Layer* pNewLayer = new Layer(pLayer,op,pMain);	
	
	ptr->AddLayer(pNewLayer);
	ptr->Refresh(); //<< !!! You can only do GUI in the main thread!!!
	AtomicDec(ptr->threads); // the last thing this thread does is clean up
}