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.

[jflesch]

Quite possible. I believe that some other sane drivers have another extra option instead of extra values for source. I'll check later.
I'll also have to look at the WIA examples to figure out how it's supposed to work on Windows.

Anyway, I think duplex support will wait for the new library (I'm going to replace pyinsane by a brand new and shiny C library).