Hi, I bought a used Avision AV220 document scanner recently and I am mostly happy with it. Fast duplex colour scanning of sheets, and it is so silent compared to the scanner I used before.
Now I have got a few questions: 1.) The scanner has got a single digit LED, an arrowed button, two more buttons labelled "Cancel" and "Scan". Though I can imagine what the latter two might do, I cannot guess the meaning of the digit and the arrow button. I can switch the number displayed from 1 to 9 and then to 1 again, but cannot see a meaning of that. I downloaded a manual for this scanner, in which the LED and the buttons are displayed but not explained. So what do these do? 2.) In scanning software such as gscan2pdf etc. there is an option to set contrast and brightness. Brightness goes from -100 (I suppose to make scans darker) to +100 (makes scans brighter). I can set this option to positive values and get brighter scans, but when I attempt to get darker scans I get an error message "Unknown message: Argument "" isn't numeric in subtraction (-) at /usr/bin/scanimage.pl line 357". This also happens if I use different backends for scanning such as scanadf.pl. In scanadf.pl it's line 380 but same error otherwise. 3.) After I enter sheets into the sheetfeeder, I select the page size and scan them. BUT: regardless which page size I have entered there always is a slight cut-off of the very top part of the sheet. The scanner always draws in the first page of a pile of sheets so there is no way for me to see if it did that correctly. Is this a problem of the back end that I use? 4.) Is the scanning area of a sheet influenced by the two red paper guides in any way? Or is only the paper size setting in the backend influencing the page size and the area that is scanned? Thanks for any hint here and kind regards, Crypto.
