Scantpaper fails to match paper size to use scanner's auto HW paper length...
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#443 Scantpaper fails to match paper size to use scanner's auto HW paper length detection
Package: scantpaper
Version: 3.0.15-2
*** PRECONDITION ***
1.) Duplex-ADF scanner Fujitsu fi-7160 used here.
2.) Task is to scan a number of calendars from the last years, which all have different paper lengths and paper widths. Scanning should be done preferably with 300DPI and colour.
3.) According to scanner manual, oversized paper sheets should be scanned in 200DPI and can have a length of max. 5588mm (I guess this must be a typo and really be 558mm/55,8cm). The calendar sheets I have here are shorter than that, current one is 44,9cm sheet length and 210mm wide. No "left" or "top" values.
4.) I bought this scanner specifically because it has an HW option to scan sheets that have no standard paper size (e.g. are way longer than standard DIN A4 etc.) and has a sensor to detect paperlength itself. This also makes mixing different sheet sizes possible as the scanner determines paper size itself (or that is what I would expect is possible).
5.) Nevertheless, as scantpaper requires this to be set, I have measured the calendar sheet sizes and created a custom line for this in settings.
6.) Apart from this, options involve "Vorlagenlänge automatisch erkennen" enabled ("Recognize automatic sheet length").
7.) It is completely unclear how the automatic size recognition is working. I would say that when this is enabled in scantpaper settings, there should not be a paper format be required, as the scanner would detect it itself automatically anyway. It should now be left to the scanner HW alone to detect the sheet length. How is this prioritized over paper size? How is this used to match against real paper size, as found by scanner? Do I need overscan enabled? Why would this matter with auto paper size detection?
8.) Paper guides are set correctly to match calendar sheets in width.
*** ACTION ***
1.) Place one sheet of calendar in ADF and scan one side @300DPI and colour.
*** OBSERVED BEHAVIOUR ***
1.) The calendar sheet is pulled from ADF, scanned and ejected. Use hands to support oversize paper from falling over ADF (OK).
2.) The scanned image shows cut-off parts of paper but also black empty area matching the missing part of non-scanned area.
*** EXPECTED BEHAVIOUR ***
2.) As all parameters of paper were set in settings - paper length and with, automatic size detection enabled etc. - and paper guides were adjusted correctly to match calender sheet width the resulting scan has no black empty area and no cut-off areas missing from sheet.
Please
scantpaper --log=log,