Two side paper scanning

[fandomas]

Does support scanners (probably an ADF type) for simultaneous two-sided scanning?
Great project btw!

Thanks.

[jflesch]

I don't have a scanner with two-sided scanning, so actually I cannot say.
Try and tell me :)

[fandomas]

i will let you know. Great project! Thank you very much. pyinsane works wonderful with Canon PIXMA MP210.

[fandomas]

Unfortunately i can't find any way of scanning of both sides simultaneously even though the scanner support that. Its a wonderful API though. If anyone find a way of two-sided scanning please inform us here. thanks.

[jflesch]

Just so I know, is there already others scanning software on Linux able to support two-sided scanning ?

[jflesch]

Also, can you run the scripts example/list_all.py ?
It will list all the options of all the scanner. Maybe the solution is here.

[russss]

It works fine for me with duplex, and has for quite a while. I think the exact configuration is device-dependent, but for me:

scanner.options['source'].value = "ADF Duplex"

[jflesch]

Unfortunately, I don't have the required hardware to test it myself. Also, @fandomas didn't report the output of example/list_all.py, so I can't even try to guess what must be done (if anything).
So I will close this ticket for now.
@fandomas > Please reopen if the solution indicated by @russss doesn't work for you.

[yuyudhan]

Hi @jflesch

Following is the list_all.py output for me, the option "ADF Duplex" isn't working for me.
Check out the bold option below which I see.

Option: source
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: ['0000\Root\Feeder']
Value: 0000\Root\Feeder

Have tried the three options here, but won't scan both the sides of page.

The scanner model is HP Scanjet Pro 3000 S3

properties = _rawapi.get_properties(dev_or_src)
Pyinsane: WARNING: A property has a type different from the one expected
C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py:116: RuntimeWarning: Pyinsane: WARNING: Got unknown clsid from driver
constraints = _rawapi.get_constraints(dev_or_src)
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Constraint found on property [sti_driver_version] but property not found
C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py:116: RuntimeWarning: Pyinsane: WARNING: Unknown var type for constraint
constraints = _rawapi.get_constraints(dev_or_src)
Pyinsane: WARNING: Unknown var type for constraint
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [preferred_format]
Pyinsane: WARNING: A property has a type different from the one expected
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Constraint found on property [sti_driver_version] but property not found
Pyinsane: WARNING: Unknown var type for constraint
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [preferred_format]
Option 'current_intent' preset to 'image_type_color,maximize_quality' on ['HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)]
Pyinsane: WARNING: A property has a type different from the one expected
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Constraint found on property [sti_driver_version] but property not found
Pyinsane: WARNING: Unknown var type for constraint
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [preferred_format]
Option 'format' preset to 'bmp' on ['HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)]
Failed to pre-set option 'preferred_format' on ['HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)]
C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py:127: RuntimeWarning: Pyinsane: WARNING: properties->WriteMultiple() failed
ret = _rawapi.set_property(dev_or_src, propname, propvalue)
Pyinsane: WARNING: properties->WriteMultiple() failed
Pyinsane: WARNING: properties->WriteMultiple() failed: page_size : 0x80070057
Exception while setting page_size: WIA: Failed to set scanner properties
WIA: Failed to set scanner properties
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\abstract.py", line 186, in _set_value
rawapi.set_property(obj, self.name, new_value)
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 134, in set_property
propname=propname, propvalue=propvalue).wait()
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 34, in wait
raise self.exception
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 39, in do
self.result = self.func(**self.kwargs)
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 129, in _set_property
raise WIAException("Failed to set scanner properties")
pyinsane2.wia.rawapi.WIAException: WIA: Failed to set scanner properties
Pyinsane: WARNING: A property has a type different from the one expected
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Constraint found on property [sti_driver_version] but property not found
Pyinsane: WARNING: Unknown var type for constraint
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [preferred_format]
Failed to pre-set option 'page_size' on ['HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)]
Pyinsane: WARNING: A property has a type different from the one expected
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Constraint found on property [sti_driver_version] but property not found
Pyinsane: WARNING: Unknown var type for constraint
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [item_category]
Pyinsane: WARNING: Got unknown clsid from driver
Pyinsane: Failed to parse constraint of [preferred_format]
Option 'depth' preset to '24' on ['HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)]
C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py:72: RuntimeWarning: Pyinsane: WARNING: WiaDevMgr->CreateDevice() failed
out = _rawapi.open(devid)
Pyinsane: WARNING: WiaDevMgr->CreateDevice() failed
Failed to access scanner ('{6BDD1FC6-810F-11D0-BEC7-08002BE2092F}\0001', 'HP ScanJet Flow 5000 s4 (USB)') : WIA: Failed to open {6BDD1FC6-810F-11D0-BEC7-08002BE2092F}\0001
WIA: Failed to open {6BDD1FC6-810F-11D0-BEC7-08002BE2092F}\0001
Traceback (most recent call last):
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\abstract.py", line 567, in get_devices
scanner = Scanner(dev[0])
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\abstract.py", line 413, in init
self._dev = rawapi.open(name)
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 79, in open
return WiaAction(_open, devid=devid).wait()
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 34, in wait
raise self.exception
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 39, in do
self.result = self.func(**self.kwargs)
File "C:\Python34\lib\site-packages\pyinsane2-2.0.10-py3.4-win-amd64.egg\pyinsane2\wia\rawapi.py", line 74, in _open
raise WIAException("Failed to open {}".format(devid))
pyinsane2.wia.rawapi.WIAException: WIA: Failed to open {6BDD1FC6-810F-11D0-BEC7-08002BE2092F}\0001
'HP ScanJet Pro 3000 s3 (USB)' (HP, HP ScanJet Pro 3000 s3 (USB), digital_camera,streaming_video)
Option: yextent
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (32, 36600)
Value: 36600
Option: optical_xres
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 600
Option: preview
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 0, 1]
Value: final_scan
Option: port_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: \.\Usbscan0
Option: compression
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 0, 2, 5]
Value: none
Option: tl-x
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 2550)
Value: 0
Option: min_vertical_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 107
Option: sti_gen_capabilities
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 49
Option: mode
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: ['Color', 'Gray', 'BW']
Value: Color
Option: hw_config
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['generic', 'scsi', 'usb', 'serial', 'parallel']
Value: 0
Option: access_rights
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: ['read', 'write', 'can_be_deleted', 'read_can_be_deleted', 'read_write_can_be_deleted']
Value: read,write,read_can_be_deleted,read_write_can_be_deleted
Option: full_item_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 0000\Root\Feeder
Option: xres
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [8, 75, 150, 200, 200, 240, 300, 400, 500, 600]
Value: 300
Option: bytes_per_line
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 7652
Option: item_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: Feeder
Option: format
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: ['bmp', 'ciff', 'exif', 'flashpix', 'gif', 'ico', 'jbig', 'jpeg', 'jpeg2k', 'jpeg2kx', 'memorybmp', 'pdfa', 'photocd', 'pict', 'png', 'raw', 'rawrgb', 'tiff']
Value: bmp
Option: threshold
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 128)
Value: 128
Option: dev_id
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: {6BDD1FC6-810F-11D0-BEC7-08002BE2092F}\0000
Option: filename_extension
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: bmp
Option: source
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: ['0000\Root\Feeder']
Value: 0000\Root\Feeder
Option: photometric_interp
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 0, 1]
Value: white_1
Option: contrast
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (-1000, 0)
Value: 0
Option: number_of_lines
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 36600
Option: preferred_format
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['bmp', 'ciff', 'exif', 'flashpix', 'gif', 'ico', 'jbig', 'jpeg', 'jpeg2k', 'jpeg2kx', 'memorybmp', 'pdfa', 'photocd', 'pict', 'png', 'raw', 'rawrgb', 'tiff']
Value: bmp
Option: optical_yres
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 600
Option: document_handling_select
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [32, 36]
Value: front_only
Option: max_vertical_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 122000
Option: pages
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 1)
Value: 1
Option: pixels_per_line
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 2550
Option: document_handling_status
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['feed_ready', 'flat_ready', 'dup_ready', 'flat_cover_up', 'path_cover_up', 'paper_jam', 'film_tpa_ready', 'storage_ready', 'storage_full', 'multiple_feed', 'device_attention', 'lamp_err']
Value: 0
Option: user_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: DESKTOP-L060A5J\Ankur Pandey
Value: DESKTOP-L060A5J\Ankur Pandey
Option: planar
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: pixel
Value: pixel
Option: pnp_id
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: \?\usb#vid_03f0&pid_5605&mi_00#6&3324a881&0&0000#{6bdd1fc6-810f-11d0-bec7-08002be2092f}
Option: yres
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [8, 75, 150, 200, 200, 240, 300, 400, 500, 600]
Value: 300
Option: resolution
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [8, 75, 150, 200, 200, 240, 300, 400, 500, 600]
Value: 300
Option: ui_clsid
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: {4DB1AD10-3391-11D2-9A33-00C04FA36145}
Option: item_category
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['root', 'flatbed', 'feeder', 'feeder_front', 'feeder_back', 'film', 'folder', 'finished_file']
Value: feeder
Option: brightness
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (-1000, 0)
Value: 0
Option: driver_version
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 41.0.680.26008
Option: buffer_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 262144
Option: br-y
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 36600)
Value: 36600
Option: tl-y
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 36600)
Value: 0
Option: xpos
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 0)
Value: 0
Option: wia_version
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 2.0
Option: vend_desc
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: HP
Option: sheet_feeder_registration
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: left_justified
Value: centered
Option: dev_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: HP ScanJet Pro 3000 s3 (USB)
Option: page_height
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 122000
Option: item_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 0
Option: item_flags
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: free
Value: file,image,programmable_data_source,transfer
Option: page_width
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 8500
Option: current_intent
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 196615]
Value: image_type_color,image_type_mask,maximize_quality,size_mask
Option: dev_type
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: default
Value: digital_camera,streaming_video
Option: xextent
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (32, 2550)
Value: 2550
Option: firmware_version
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 1.0.na
Option: server_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: local
Option: tymed
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [1, 2, 2]
Value: file
Option: datatype
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 2, 3, 3, 3]
Value: color
Option: max_horizontal_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 8500
Option: orientation
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [0, 0, 1]
Value: portrait
Option: min_horizontal_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 107
Option: bits_per_channel
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 8
Option: document_handling_capabilities
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['auto_source', 'dup', 'detect_film_tpa', 'detect_stor', 'film_tpa', 'stor', 'detect_feed', 'detect_flat', 'detect_scan', 'dup', 'feed', 'flat', 'detect_dup', 'detect_dup_avail', 'detect_feed_avail']
Value: dup,feed
Option: page_size
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [1, 2, 2]
Value: custom
Option: ypos
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 0)
Value: 0
Option: icm_profile_name
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: ['', 'sRGB Color Space Profile.icm', 'sRGB Color Space Profile.icm']
Value: sRGB Color Space Profile.icm
Option: depth
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: [1, 3, 8, 24, 24]
Value: 24
Option: baudrate
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value:
Option: br-x
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: rw
Constraint type: None
Constraint: (0, 2550)
Value: 2550
Option: channels_per_pixel
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: 3
Option: remote_dev_id
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value:
Option: dev_desc
Title:
Desc:
Type: None
Unit: None
Size: 4
Capabilities: Access: ro
Constraint type: None
Constraint: None
Value: HP ScanJet Pro 3000 s3 (USB)

[jflesch]

@yuyudhan the thing is, you're using Windows, while @russss is using Linux.

@yuyudhan : when you say "the option "ADF Duplex" isn't working for me.", you mean it doesn't scan at all, it scans only the recto side of pages, or something else ?

[russss]

I'm actually using a Mac but I'd guess the option depends more on the driver than on the OS. My scanner is a Fujitsu.

Looks like 0000\Root\Feeder is one option and the only one it's presenting though?

Can you run sane's scanimage tool from the command line? Mine lists the options when I call scanimage --help:

Options specific to device `epjitsu:libusb:001:015-04c5-11ed-ff-ff':
  Scan Mode:
    --source ADF Front|ADF Back|ADF Duplex [ADF Front]
        Selects the scan source (such as a document-feeder).

For completeness, this is what list_all.py gives me for the source option:

  Option: source
    Title: Scan source
    Desc: Selects the scan source (such as a document-feeder).
    Type: <class 'pyinsane.rawapi.SaneValueType'> : String (3)
    Unit: <class 'pyinsane.rawapi.SaneUnit'> : None (0)
    Size: 11
    Capabilities: <class 'pyinsane.rawapi.SaneCapabilities'> :[ Soft_select, Soft_detect,]
    Constraint type: <class 'pyinsane.rawapi.SaneConstraintType'> : String list (3)
    Constraint: ['ADF Front', 'ADF Back', 'ADF Duplex']
    Value: ADF Front

[jflesch]

0000\Root\Feeder is clearly a WIA source (Windows), not a Sane one (Linux, MacOSX, BSD, etc), so he doesn't have scanimage.
I have this feeling that duplex support will be quite different between WIA and Sane .. :/

[russss]

Ah. I've got nothing then. But my suspicion is that the "ADF Duplex" thing is specific to the epjitsu SANE driver.