diff --git a/ApplicationCode/Application/RiaApplication.cpp b/ApplicationCode/Application/RiaApplication.cpp
index 6219d5ec1a..f5b107bc87 100644
--- a/ApplicationCode/Application/RiaApplication.cpp
+++ b/ApplicationCode/Application/RiaApplication.cpp
@@ -1401,6 +1401,8 @@ void RiaApplication::runRegressionTest(const QString& testRootPath)
              }
              m_commandQueueLock.unlock();
 
+             regressionTestSetFixedSizeForAllViews();
+
              saveSnapshotForAllViews(generatedFolderName);
 
              QDir baseDir(testCaseFolder.filePath(baseFolderName));
@@ -1776,7 +1778,8 @@ void RiaApplication::executeRegressionTests(const QString& regressionTestPath)
     if (mainWnd)
     {
         mainWnd->hideAllDockWindows();
-
+ 
+        mainWnd->setDefaultWindowSize();
         runRegressionTest(regressionTestPath);
 
         mainWnd->loadWinGeoAndDockToolBarLayout();
@@ -1784,3 +1787,34 @@ void RiaApplication::executeRegressionTests(const QString& regressionTestPath)
 }
 
 
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+void RiaApplication::regressionTestSetFixedSizeForAllViews()
+{
+    RiuMainWindow* mainWnd = RiuMainWindow::instance();
+    if (!mainWnd) return;
+
+    if (m_project.isNull()) return;
+
+    std::vector<RimCase*> projectCases;
+    m_project->allCases(projectCases);
+
+    for (size_t i = 0; i < projectCases.size(); i++)
+    {
+        RimCase* ri = projectCases[i];
+        if (!ri) continue;
+
+        for (size_t j = 0; j < ri->reservoirViews().size(); j++)
+        {
+            RimReservoirView* riv = ri->reservoirViews()[j];
+
+            if (riv && riv->viewer())
+            {
+                // This size is set to match the regression test reference images
+                riv->viewer()->setFixedSize(1000, 745);
+            }
+        }
+    }
+}
+
diff --git a/ApplicationCode/Application/RiaApplication.h b/ApplicationCode/Application/RiaApplication.h
index 4c3c0d5aca..bcc305ceba 100644
--- a/ApplicationCode/Application/RiaApplication.h
+++ b/ApplicationCode/Application/RiaApplication.h
@@ -105,6 +105,7 @@ public:
     void                saveSnapshotForAllViews(const QString& snapshotFolderName);
     void                runRegressionTest(const QString& testRootPath);
     void                updateRegressionTest(const QString& testRootPath );
+    void                regressionTestSetFixedSizeForAllViews();
 
     void                processNonGuiEvents();
 
diff --git a/ApplicationCode/Application/RiaImageFileCompare.cpp b/ApplicationCode/Application/RiaImageFileCompare.cpp
index d184e97c4a..4b1cde4108 100644
--- a/ApplicationCode/Application/RiaImageFileCompare.cpp
+++ b/ApplicationCode/Application/RiaImageFileCompare.cpp
@@ -71,9 +71,15 @@ bool RiaImageFileCompare::runComparison(QString imgFileName, QString refFileName
     }
 
 
-    //QString args = QString("-fuzz 2% -lowlight-color white -metric ae \"%1\" \"%2\" \"%3\"").arg(imgFileName).arg(refFileName).arg((diffFileName));
-    QString args = QString("-lowlight-color white -metric ae \"%1\" \"%2\" \"%3\"").arg(imgFileName).arg(refFileName).arg((diffFileName));
-    QString completeCommand = QString("\"%1\" %2").arg(m_compareExecutable).arg(args);
+    //QString args = QString("-fuzz 2% -lowlight-color white -metric ae \"%1\" \"%2\" \"%3\"").arg(imgFileName).arg(refFileName).arg((diffFileName));
+    // The ImageMagick compare tool on RedHat 5 does not support the lowlight-color options
+    // Use GCC version as a crude mechanism for disabling use of this option on RedHat5
+#if (__GNUC__ == 4 && __GNUC_MINOR__ <= 1)
+    QString args = QString("-metric ae \"%1\" \"%2\" \"%3\"").arg(imgFileName).arg(refFileName).arg((diffFileName));
+#else
+    QString args = QString("-lowlight-color white -metric ae \"%1\" \"%2\" \"%3\"").arg(imgFileName).arg(refFileName).arg((diffFileName));
+#endif
+    QString completeCommand = QString("\"%1\" %2").arg(m_compareExecutable).arg(args);
 
     // Launch process and wait
     QProcess proc;
diff --git a/ApplicationCode/RiaMain.cpp b/ApplicationCode/RiaMain.cpp
index b930b3449f..6e3fd89be4 100644
--- a/ApplicationCode/RiaMain.cpp
+++ b/ApplicationCode/RiaMain.cpp
@@ -30,11 +30,7 @@ int main(int argc, char *argv[])
     RiuMainWindow window;
     QString platform = cvf::System::is64Bit() ? "(64bit)" : "(32bit)";
     window.setWindowTitle("ResInsight " + platform);
-#ifdef CVF_LINUX
-    window.resize(1000, 806);
-#else
-     window.resize(1000, 800);
-#endif
+    window.setDefaultWindowSize();
     window.show();
 
     if (app.parseArguments())
diff --git a/ApplicationCode/UserInterface/RiuMainWindow.cpp b/ApplicationCode/UserInterface/RiuMainWindow.cpp
index cc57642a2f..95804ce993 100644
--- a/ApplicationCode/UserInterface/RiuMainWindow.cpp
+++ b/ApplicationCode/UserInterface/RiuMainWindow.cpp
@@ -1760,3 +1760,11 @@ void RiuMainWindow::slotExecutePaintEventPerformanceTest()
         setResultInfo(resultInfo);
     }
 }
+
+//--------------------------------------------------------------------------------------------------
+/// 
+//--------------------------------------------------------------------------------------------------
+void RiuMainWindow::setDefaultWindowSize()
+{
+    resize(1000, 810);
+}
diff --git a/ApplicationCode/UserInterface/RiuMainWindow.h b/ApplicationCode/UserInterface/RiuMainWindow.h
index 0f30717413..25e96c77cc 100644
--- a/ApplicationCode/UserInterface/RiuMainWindow.h
+++ b/ApplicationCode/UserInterface/RiuMainWindow.h
@@ -93,6 +93,8 @@ public:
 
     void            selectedCases(std::vector<RimCase*>& cases);
 
+    void            setDefaultWindowSize();
+
 protected:
     virtual void	closeEvent(QCloseEvent* event);