Change lighting length to be based on when cameras report finished

Fix viewer handling when cammeras are available

src/ui/cvimageviewer.cpp

@@ -186,6 +186,7 @@ void CvImageViewer::convertImage(cv::Mat image)
 void CvImageViewer::setImage(Camera::Image img)
 {
 	origImage_=img.mat;
+	clamp_ = std::numeric_limits<double>::max();
 	qDebug()<<"viwer got"<<image_.rows<<'x'<<image_.cols<<" type "<<image_.type()<<"image from camera"<<img.cameraId;
 	convertImage(img.mat);
 	update();