[sane-devel] Regarding Canon DR-2050C using sane-1.0.20 backend _ Duplex Option

[Rajesh Shah]

Thank you very much for your reply . I was able to scan the page with 
duplex mode ..

Basically my requirement is to create a multipage image with optimum 
size in tiff .

I am using the following command to acheive a single tiff file from 2 
tiffs.

On doing so , I get this

# tiffcp -c g4 img1.tiff img2.tiff img3.tiff
img3.tiff: Bits/sample must be 1 for Group 3/4 encoding/decoding.
img3.tiff: Error, can't write strip 0.


I also used the tiffinfo img1.tiff to get the deetails of the file .
[rrshah at rajeshoffice ~]$ tiffinfo img2.tiff
TIFF Directory at offset 0x8 (8)
  Subfile Type: (0 = 0x0)
  Image Width: 850 Image Length: 1100
  Resolution: 100, 100 pixels/inch
  Bits/Sample: 8
  Compression Scheme: None
  Photometric Interpretation: min-is-black
  Orientation: row 0 top, col 0 lhs
  Samples/Pixel: 1
  Rows/Strip: 1100
  Min Sample Value: 0
  Max Sample Value: 255
  Planar Configuration: single image plane


After searching furthure on this case , I found that the tiff files 
should in Black and White ( or LineArt) .. I then used the mode but 
there are only 2 modes one is gray and other is colour  .

Kindly help .. I am almost on the verge of getting this working ..

Rajesh Shah



m. allan noah wrote:
> You have told the backend (scanner driver) that you want duplex data, 
> but you have not told the frontend (scanimage) that it should grab 
> more than one page. Try this instead:
>
> scanimage -d canon_dr:libusb:002:006 --source 'ADF Duplex' 
> --resolution 100 --format=tiff -b
>
> This will produce images in your current directory called out1.tif, 
> out2.tif, etc. These names can be changed, see scanimage manpage.
>
> Also, please note, that support for this machine is somewhat basic in 
> sane 1.0.20. In the last week I have added calibration and fixed many 
> bugs. I would HIGHLY suggest that you upgrade to a recent 
> sane-backends git snapshot, the scanner will be much more useful and 
> the image quality significantly improved.
>
> allan
>
> On Sun, Jun 21, 2009 at 6:18 AM, Rajesh Shah <rajesh at finlogicindia.com 
> <mailto:rajesh at finlogicindia.com>> wrote:
>
>     Dear All ,
>     I am posting for the first time . I am not a developer . But I was
>     testing sane-1.0.20 backend on Canon DR-2050 C.
>     I am using Mandriva Spring 2009.
>
>     Using the following Command I am able to Scan but not able to use
>     the Duplex Feature . Result is single page scan similarly to ADF Front
>
>     # scanimage -d canon_dr:libusb:002:006 --source 'ADF Duplex'
>     --resolution 100 --format=tiff > 2image.tiff
>
>     Please note ,I have also tried the double quotes .ie "ADF Duplex"
>     but same results . Kindly guide .
>
>     Even after I removed the source option , the size of the file
>     remained the same .
>
>     I think , I am few steps away from configuring it successfully .
>     Please help and guide .
>
>
>
>
>
>
>
>
>
>
>
>
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