diff --git a/rawimage.cpp b/rawimage.cpp
index c2fd18c..f052333 100644
--- a/rawimage.cpp
+++ b/rawimage.cpp
@@ -109,7 +109,6 @@ void RawImage::calcStats()
 {
     cv::Scalar meanS, stdDevS;
 
-    qDebug() << m_img.type();
     cv::meanStdDev(m_img, meanS, stdDevS);
     cv::minMaxIdx(m_img, &m_min, &m_max);
 
@@ -133,7 +132,9 @@ void RawImage::calcStats()
             break;
         }
     }
-    cv::Mat absDev = cv::abs(m_img-m_median);
+    cv::Mat absDev;
+    m_img.convertTo(absDev, CV_32F, 1, -m_median);
+    absDev = cv::abs(absDev);
     cv::Mat madHist;
     medianSum = 0;
     cv::calcHist(&absDev, 1, nullptr, cv::Mat(), madHist, 1, &histSize, ranges);