i write a class extends vtkPanel,the problem solved,. Seb,thank you so so much!!! -- View this message in context: http://vtk.1045678.n5.nabble.com/a-question-about-save-vtkRenderWindow-as-JPEG-file-tp4940006p4947957.html Sent from the VTK - Users mailing list archive at Nabble.com.