Index: CTK-71799c27da506c899f2ef04b50cd8d454374870d/Libs/Widgets/ctkMaterialPropertyPreviewLabel.cpp
===================================================================
--- CTK-71799c27da506c899f2ef04b50cd8d454374870d.orig/Libs/Widgets/ctkMaterialPropertyPreviewLabel.cpp
+++ CTK-71799c27da506c899f2ef04b50cd8d454374870d/Libs/Widgets/ctkMaterialPropertyPreviewLabel.cpp
@@ -315,10 +315,10 @@ void ctkMaterialPropertyPreviewLabel::dr
           }
         else
           {
-          rgba = qRgba(static_cast<unsigned char>(qMin(255. * intensity.x() * opacity + qRed(rgba)*(1. - opacity), static_cast<qreal>(255.))),
-                       static_cast<unsigned char>(qMin(255. * intensity.y() * opacity + qGreen(rgba)*(1. - opacity), static_cast<qreal>(255.))),
-                       static_cast<unsigned char>(qMin(255. * intensity.z() * opacity + qBlue(rgba)*(1. - opacity), static_cast<qreal>(255.))),
-                       static_cast<unsigned char>(qMin(255. * opacity + qAlpha(rgba)*(1. - opacity), static_cast<qreal>(255.))));
+          rgba = qRgba(static_cast<unsigned char>(qMin(static_cast<qreal>(255. * intensity.x() * opacity + qRed(rgba)*(1. - opacity)), static_cast<qreal>(255.))),
+                       static_cast<unsigned char>(qMin(static_cast<qreal>(255. * intensity.y() * opacity + qGreen(rgba)*(1. - opacity)), static_cast<qreal>(255.))),
+                       static_cast<unsigned char>(qMin(static_cast<qreal>(255. * intensity.z() * opacity + qBlue(rgba)*(1. - opacity)), static_cast<qreal>(255.))),
+                       static_cast<unsigned char>(qMin(static_cast<qreal>(255. * opacity + qAlpha(rgba)*(1. - opacity)), static_cast<qreal>(255.))));
           }
         }
       image.setPixel(i,j,rgba);