[sane-devel] Epson Perfection 610 Issue with 150 dpi scan

[Rainer Dorsch]

Hi Alessandro and Olaf,

thanks for the patch.

Am Freitag, 8. Januar 2010 schrieb Alessandro Zummo:
> On Fri, 8 Jan 2010 00:25:54 +0100
>
> Rainer Dorsch <rdorsch at web.de> wrote:
> >  will can do more tests on the weekend. Is there something you would
> > consider of high value? Varying resolutions? Varying color, grayscale,
> > and binary? Others? Do you want to see the debug output? If yes, debug
> > level 18?
>
>  Hi, I have another patch, with the changes suggested by Olaf.
>  color shuffle is enabled only in color mode, you might want to
>  test it with 150 and 300 dpi, it should be enough.
>
>  If you experience problems you can send me the output at level
>  18. if everything is ok I'll commit the patch.

I applied the patch, build, and tested all supported color resolutions (75, 
150, 300, 600). I list below how many lines where requested, what the backend 
requested, and what the scanner really scanned:

(table best viewed with monospace font)

res |  lines requested | backend requested |  lines scanned
    |          by user |        by backend |
------------------------------------------------------------
 75 |              877 |               873 |            873
150 |             1754 |              1746 |           1746
300 |             3508 |              3492 |           3496
600 |             7016 |              6984 |           7016

All generated pnms were accepted by imagemagick.


Here all the details:

I applied the patch and got the warning again.

rd at dell:~/SW.nobackup/sane-backends$ git apply ~/p610.patch
/home/rd/p610.patch:172: trailing whitespace.

/home/rd/p610.patch:247: trailing whitespace.
        else if ((s->hw->cmd->level[0] == 'B') && (s->hw->level == 4) /* 
B4 !color */
warning: 2 lines add whitespace errors.
rd at dell:~/SW.nobackup/sane-backends$

I did the test with

rd at dell:~/sane-test$ for r in 150 300 75 600; do
> SANE_DEBUG_EPSON2=18 scanimage -d 'epson2:libusb:001:003' --mode='Color' -y 
297 -l 0 --resolution=$r -x 210 -t 0 -v >$r/test.pnm 2> $r/test-patch2.dbg
> echo $r done
> done

requested scan length: -y 297 -l 0

Test done: all supported color modes: 75/150/300/600 dpi color

75 dpi:
-> requested scan length: 29.7 cm
-> calculated accurate number of lines: 877
-> adjusted params.lines for color_shuffle by 4 to 873
-> scanned length: 29.57 cm
-> scanimage: read 1613304 bytes in total
    (scanner scans as much lines as requested by backend, 873)
-> current error: 1.3mm

150dpi:
-> requested scan length: 29.7 cm
-> calculated accurate number of lines: 1754
-> adjusted params.lines for color_shuffle by 8 to 1746
-> scanned length: 29.57 cm
-> scanimage: read 6495120 bytes in total
    (scanner scans as much lines as requested by backend, 1746)
-> current error: 1.3mm

300dpi:
-> requested scan length: 29.7 cm
-> calculated accurate number of lines: 3508
-> adjusted params.lines for color_shuffle by 16 to 3492
-> scanned length: 29.57 cm
-> scanimage: WARNING: read more data than announced by backend 
(26010240/25980480)
     corresponds to 3496 lines
-> current error: 1.0mm

600dpi:
-> requested scan length: 29.7 cm
-> calculated accurate number of lines: 7016
-> adjusted params.lines for color_shuffle by 32 to 6984
-> scanned length: 29.57 cm
-> scanimage: WARNING: read more data than announced by backend 
(104398080/103921920)
    corresponds to 7016
-> error: 0mm

Full debug data are available at
http://bokomoko.de/~rd/sane-test/

Thanks,
Rainer

-- 
Rainer Dorsch
Lärchenstr. 6
D-72135 Dettenhausen
07157-734133
email: rdorsch at web.de
jabber: rdorsch at jabber.org
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