plustek: Re: Plustek 9636T scans color/grey incorrectly FURTHER
Subject:
Re: Plustek 9636T scans color/grey incorrectly FURTHER
From:
Mark Bratcher ####@####.####
Date:
24 Jan 2001 03:47:37 -0000
Message-Id: <3A6E5154.FD5F2E98@rochester.rr.com>
OK, I tried several tests. Here is my setup:
RedHat Linux 6.2
Kernel 2.4.0
Plustek Driver 0_37_23
Sane 1.0.3
XScanImage (resolution 200, color, normal)
"if 1" set in plustek_scan.h (the default setting)
Scan subject: a small envelop with black writing and colorful postage
stamp
First set of tests
0. Open XScanImage
1. Prescan: came out purple
2. Prescan: almost OK, but had some "jogged" scan lines, black has cyan
shadow
3. Prescan: same as #2
4. Prescan: same as #2 plus faint vertical purple stripes
5. Prescan: same as #2
6. Scan: white areas came out cyan, and black had yellow-green shadows
7. Close XScanImage
Second set of tests
0. Open XScanImage
1. Scan: same as #2 in first test
2. Prescan: no obvious jogging, some vertical stripes in white
background
3. Prescan: No obvious jogging, a lot more vertical stripes in white
background
4. Prescan: same as #2 in first test
5. Scan: white areas OK, black has yellow shadow
6. Scan: white areas light green, black has yellow shadow
7. Scan: white areas purple, black has two different shadows
8. Close XScanImage
I did several more similar tests. I also did some with "if 0" set in
plustek_scan.h and recompiled/installed the plustek driver. If anything,
the "if 0" scans tended to come out worse (one was not only discolored,
but horribly skewed). But overall I never got a 100% good scan. I think
I'd have to run quite a few more tests (100? 1000?) to statistically
claim that "if 0" is really different than "if 1" in results.
Also, although I did not run many tests on kernel 2.2.17, I was seeing
the same type of failures there.
Mark
