[sane-devel] Option text help

abel deuring adeuring at gmx.net
Sat Aug 10 11:29:48 BST 2019

Am 10.08.19 um 09:31 schrieb Olaf Meeuwissen:
> Hi Ralph,
> littlesincanada writes:
>> Hi,
>> While scanning through the messages to fix up some grammar and spelling
>> mistakes, I came across this following in the file:
>> backend/kvs40xx_opt.c:405
>> There is a message that I cannot decipher:
>> "Long Paper Mode is a mode that the scanner reads the image after it
>> divides long paper by the length which is set in Document Size option."
>> Can anyone tell me what it means and what it does?

I have no direct experience at all with these big Panasonic scanners.
But your question (which I noticed only now in Olaf's reply...) made me
curious. So I tried to find some hint what could be meant by searching
for manuals of one of the scanners supported by the kvs40xx backend,
specifically, the model KV-S3085. The manual of Panasonic's own "Image
Capture Software" gives a clue.

- Open this page:


- Scroll to the section "Image Capture Software"

- Click the "manual" link for version

- Accept Panasonic's "EULA for manuals"

- or directly open


Page 92, section 9.2.15 is about "Long Paper". As I understand it, the
scanner sends in "long paper" mode a sequence of images, where the size
of the images is determined by the page size settings. But I did not
read the manual very carefully, so I could also be totally wrong...


> I think only someone with a suitable scanner can "reverse engineer" what
> was meant.
> I checked the backend's history and the message has been like that from
> the start.  Allan committed it, way back on 2011-06-06, but the code is
> originally from Panasonic Russia.
> BTW, the third-party utsushi backend also has a Long Paper Mode.  I'm
> not sure it's the same thing but that option's documentation says
>   "Select this mode if you want to scan documents longer than"
>   " what the ADF would normally support.  Please note that it"
>   " only supports automatic detection of the document height."
> IIRC, the ADF would report a maximum document length but when this mode
> is enabled allows you to scan beyond that maximum.  This is useful in
> cases where you need to scan long roll paper outputs, e.g. cardiograms
> or cash register receipts.
> Maybe this gives a clue
> --
> Olaf Meeuwissen, LPIC-2            FSF Associate Member since 2004-01-27
>  GnuPG key: F84A2DD9/B3C0 2F47 EA19 64F4 9F13  F43E B8A4 A88A F84A 2DD9
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