Dear allan: I am sorry to trouble you again, I can use the sane backend by following methods, SANE_DEBUG_RICOH=255 scanimage --format=tiff >out1.tiff
but if no environment variables "SANE_DEBUG_RICOH=255", sane will not be able to work => scanimage: no SANE devices found. Excuse me, Is this what I need to do? Look forward to your help, Thank you~ Best Regard Yours Sincerely, Yihao
