gscan2pdf not recognising ADF duplex mode with Epson epkowa library

Bug #1001208 reported by Joe Taylor on 2012-05-18
This bug affects 3 people
Affects Status Importance Assigned to Milestone
gscan2pdf (Ubuntu)

Bug Description

Hardware/software used:

Epson BX635FWD printer/scanner over wi-fi connection - firmware: KR27BB 57.57
Ubuntu 12.04 LTS
gscan2pdf 0.9.32

Image Scan! for Linux also installed on machine (from

Description of problem:

gscan2pdf connects to the scanner fine and (correctly) shows options of

[Scan source] = "Flatbed"/"Automatic document feeder"
[ADF Mode] = "Simplex"/"Duplex"

under "Optional equipment" tab. However, when "Automatic document feeder" and "Duplex" are selected, "Page Options" tab gives only the options of

[Side to scan] = "Facing"/"Reverse"

- there is no "Both" option to scan both sides, even when [Source document] = "Double sided" is selected.

Resultant behaviour when scanning using ADF Duplex mode is that both sides are scanned, but reverse pages come out 180 degrees inverted. Changing post-processing options does not correct this as gscan2pdf seemingly does not differentiate between the facing/reverse pages from epkowa's output. The only fix at present seems to be to manually correct the output each time.

I don't have a duplex scanner, and the Facing/Reverse/Double Sided options in "Page Options" tab are aimed at scanning double sided paper with a simplex scanner.

I must get around to properly supporting duplex scanners.

Launchpad Janitor (janitor) wrote :

Status changed to 'Confirmed' because the bug affects multiple users.

Changed in gscan2pdf (Ubuntu):
status: New → Confirmed
scruss (scruss) wrote :

The Epson duplex scanners don't (unfortunately) report the fact that they scan even pages upside down from the ADF. Their own software (including the built-in scan to PDF on SD card function) flags the rotated pages in the PDF so they display properly, but the raster is actual stored bottom to top on alternate pages.

You can confirm this with a command like:

    scanimage --format tiff --mode Binary --resolution 75 --scan-area 'Letter Portrait' --source 'Automatic Document Feeder' --adf-mode Duplex --batch='duplex%d.tif' --progress

and every other TIFF file will be upside down, with no tags indicating orientation. So this might have to be an explicit option.

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