Revert changes of image-saving (commit ea2fcd94^)
Revert changes of image-saving (commit ea2fcd94^)

Since the PNG was written as RGB, we sometimes crashed the
AnalyzeExperiments script.
Since the analysis is only done on Linux, we can live with that...

habi/GlobalDiagnostiX,habi/GlobalDiagnostiX,habi/GlobalDiagnostiX