def view_images(self, img_list, img_type=None):
        ''' Launches image viewer (depending on backend) '''
        viewer = self.parent.gparams.advanced.image_viewer
        if viewer == 'cxi.view' and 'pickle' not in img_type:
            wx.MessageBox('cxi.view only accepts image pickles', 'Warning',
                          wx.OK | wx.ICON_EXCLAMATION)
        else:
            if len(img_list) > 10:
                view_warning = dlg.ViewerWarning(self, len(img_list))
                if view_warning.ShowModal() == wx.ID_OK:
                    # parse 'other' entry
                    img_no_string = str(view_warning.no_images).split(',')
                    filenames = []
                    for n in img_no_string:
                        if '-' in n:
                            img_limits = n.split('-')
                            start = int(min(img_limits))
                            end = int(max(img_limits))
                            if start <= len(img_list) and end <= len(img_list):
                                filenames.extend(img_list[start:end])
                        else:
                            if int(n) <= len(img_list):
                                filenames.append(img_list[int(n)])
                    file_string = ' '.join(filenames)
                else:
                    return
                view_warning.Close()
            elif viewer == 'distl.image_viewer' and len(img_list) > 1:
                wx.MessageBox('distl.image_viewer can show only one image',
                              'Warning', wx.OK | wx.ICON_EXCLAMATION)
                file_string = img_list[0]
            else:
                file_string = ' '.join(img_list)

            viewer = thr.ImageViewerThread(self,
                                           viewer=viewer,
                                           file_string=file_string,
                                           img_type=img_type)
            viewer.start()
 def view_image(self):
     viewer = thr.ImageViewerThread(self, file_string=self.img_filename)
     viewer.start()