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

[m. allan noah]

On Mon, Jun 22, 2009 at 8:39 AM, Rajesh Shah<rajesh at finlogicindia.com> wrote:
> 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 ..

The hardware does not support lineart mode. However, the updated
version of the backend in sane git tree will manufacture this data
from gray scans. Please upgrade.

allan
-- 
"The truth is an offense, but not a sin"