[sane-devel] TPU functionality in epson2-backend.

m. allan noah kitno455 at gmail.com
Tue Nov 22 01:12:32 UTC 2011

Sane is free/open source software. Take a spin thru the backend, and see if
you can find a good place to send this command.


On Mon, Nov 21, 2011 at 7:05 PM, Martin Zackrisson <
martin.zackrisson at cmb.gu.se> wrote:

> On 2011-11-21 00:56, Olaf Meeuwissen wrote:
>> No clue what capability 32829 is, but the scanner protocol command that
>> selects whether you use the flatbed or TPU option uses the same values.
>> That is, 0 will do a flatbed scan, 1 a TPU scan.
>>  I'm not versed in c++, so I wonder if such a capability could be
>>> included in SANE?
>> It could, but I seriously doubt it should as it would drive the scanner
>> outside of its spec.
>>  Thanks very much for your reply.
> I suspect that the scanner has a TPU capability limit is set lower since
> Epson must have assumed that people are not interested in scanning the full
> area in TPU mode (you are meant to use their fixtures to scan negatives
> etc. which all fall inside the standard TPU capability range).
> However, under Windows it is indeed possible to extend it. In fact the
> reason I found out about the 32829 was because I monitored what settings
> were changed when I launched Epson's own scanning interface (Two more did,
> but I never found any functionality connected to them). And changing this
> value to 1 does the trick/allows full size scanning. I've gotten many
> images that way, and I don't see any significant quality drop outside the
> standard max-range. Swithing it back to 0 and you get the smaller scanning
> area - all other settings equal. The setting could mean something like "use
> full sensor width/length".
> Unfortunately for me, my use of the scanner demands that I succeed in
> getting the full image. So I would very much appreciate having this feature
> included or directions for how I could build it myself. Else, I would have
> to surrender back to Windows and TWAIN again. Also, my brute-force solution
> to the lamp-issue below is by simply cutting power to the scanner. This
> requires me to work in Linux. So I'm in a bit of a tight spot here.
> Best regards,
> Martin Zackrisson
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"The truth is an offense, but not a sin"
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