Hello. You walked into a little trap with the default options of the sane-umax backend. By default the option "custom-gamma" is enabled what means that you have to send a gamma table or you have to disable the option "custom-gamma".
When you do scanimage -d umax:/dev/sgb --source "Transparency Adapter" --resolution 300 -l 30 -t 10 -x 175 -y 225 --depth 12 --custom-gamma=no then you should get good results. I will think about it if there is a chance to get rid of this trap. Bye Oliver Piernicola Oliva schrieb: > > Hi, > I'm sorry for annoying you again, but I can't solve the problem. > I am using the command > > scanimage -d umax:/dev/sgb --source Transparency Adapter --resolution 300dpi > -l 30 -t 10 -x 175 -y 225 --depth 12 > > so I should obtain 12bit (in two byte) per channel per pixel. > But this is a picture of bytes (two for one channel) that I obtain: > > 00001001 - 10100000 > 00001010 - 11110000 > 00001000 - 00100000 > 00001001 - 01100000 > 00001010 - 10010000 > 00001000 - 01100000 > 00001001 - 10000000 > 00001010 - 10110000 > 00001000 - 10000000 > 00001001 - 11100000 > 00001010 - 11010000 > 00001000 - 11000000 > 00001001 - 11100000 > 00001010 - 11110000 > 00001000 - 10010000 > 00001001 - 10100000 > 00001010 - 11010000 > 00001000 - 01100000 > 00001001 - 10100000 > 00001010 - 11000000 > 00001000 - 00110000 > 00001001 - 10000000 > 00001010 - 10000000 > > as you can see, they 8 bits values shifted of 4 bits. > what happens? > Am I doing something wrong? > Thank you > Pier > > On Saturday 16 November 2002 00:16, Oliver Rauch wrote: > > When you do not use any gamma table options it is ok. > > > > SANE supports images with a color depth of 8 or 16 bits/sample. > > A 12 bit sample does use 16 bits (2 bytes). The raw data of UMAX > > or Linotype scanners already is transfered from the scanner to the > > backend in this format. It is the raw format of the scanner. > > > > Best regards > > Oliver > > -- > \ name: Piernicola OLIVA > o/\_ address: Universita' degli Studi di Sassari > <\__,\ Struttura Dipartimentale di Matematica e Fisica > "> | via Vienna 2, 07100, Sassari, Italia > ` | tel: +39/079229486 (office) > \ +39/3401450473 (mobile) > \ fax: +39/079229482 > \ e-mail: [email protected] -- Homepage: http://www.rauch-domain.de sane-umax: http://www.rauch-domain.de/sane-umax xsane: http://www.xsane.org E-Mail: mailto:[email protected]
