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src/p/y/pymca-HEAD/PyMca5/PyMcaGui/pymca/RGBCorrelatorWidget.py   pymca(Download)
                    #try a pure image format from PyQt
                    qimage = qt.QImage(fname)
                    if qimage.isNull():
                        msg = qt.QMessageBox(self)
                        msg.setIcon(qt.QMessageBox.Critical)

src/p/y/pymca-HEAD/PyMca5/PyMcaPlugins/ExternalImagesStackPlugin.py   pymca(Download)
            for filename in filenamelist:
                image = qt.QImage(filename)
                if image.isNull():
                    msg = qt.QMessageBox(self)
                    msg.setIcon(qt.QMessageBox.Critical)