diff --git a/src/ui/mainwindow.cpp b/src/ui/mainwindow.cpp
index 4ca65ee..1fce754 100644
--- a/src/ui/mainwindow.cpp
+++ b/src/ui/mainwindow.cpp
@@ -20,6 +20,8 @@
 #include <QMessageBox>
 #include <uvosled.h>
 #include <QFileDialog>
+#include <opencv2/imgcodecs.hpp>
+#include <opencv2/imgproc.hpp>
 
 #include "../profile.h"
 
@@ -86,33 +88,47 @@ void MainWindow::saveImage()
 
 void MainWindow::openImage()
 {
-	QString fileName = QFileDialog::getOpenFileName(this, "Open Image", lastSavedPath_, "*.mat");
+	QString fileName = QFileDialog::getOpenFileName(this, "Open Image", lastSavedPath_, "*.mat *.png");
 	if(!fileName.isEmpty())
 	{
 		cv::Mat image;
-		cv::FileStorage matf(fileName.toStdString(), cv::FileStorage::READ);
-		try
+		QStringList tokens = fileName.split('.');
+		if(tokens.back() == "png")
 		{
-			matf["image"]>>image;
+			image = cv::imread(fileName.toStdString());
+			if(image.data && image.channels() == 3)
+				cv::cvtColor(image, image, cv::COLOR_BGR2GRAY);
+			image.convertTo(image, CV_32FC1, 1.0/255.0, 0);
 		}
-		catch(const cv::Exception& ex)
+		else
 		{
-			qDebug()<<ex.what();
-			QMessageBox::warning(this, "Invalid file", "File selected dose not contain a valid image");
-			return;
-		}
+			cv::FileStorage matf(fileName.toStdString(), cv::FileStorage::READ);
+			try
+			{
+				matf["image"]>>image;
+			}
+			catch(const cv::Exception& ex)
+			{
+				qDebug()<<ex.what();
+				QMessageBox::warning(this, "Invalid file", "File selected dose not contain a valid image");
+				return;
+			}
 
-		if(matf.isOpened() && (!image.data || image.type() != CV_32FC1))
-		{
-			image.release();
-			QMessageBox::warning(this, "Invalid file", "File selected dose not contain a valid image");
+			if(matf.isOpened() && (!image.data || image.type() != CV_32FC1))
+			{
+				image.release();
+				QMessageBox::warning(this, "Invalid file", "File selected dose not contain a valid image");
+			}
+			matf.release();
 		}
-		else if(!image.data)
+		if(!image.data)
 		{
 			QMessageBox::warning(this, "Can no open", "Can not open file selected");
 		}
-		matf.release();
-		ui->mainViewer->setImage(Camera::Image(image, 0));
+		else
+		{
+			ui->mainViewer->setImage(Camera::Image(image, 0));
+		}
 	}
 }