re-aligning? re-calibrating? an hp scanjet IIc

From: Carlos Puchol (cpg@rocketmail.com)
Date: Mon Jan 17 2000 - 02:54:52 PST

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    hello,

    i am running out of sources here. since there are experts
    here, i am going to throw this up and would appreciate any
    help andor pointers.

    i am running sane 1.0.1 with xsane (nice! btw) and gimp:

    Vendor: HP Model: C1750A Rev: 3226

    this scanner was running fine and now, after some moving and
    some period of rest in storage, it displays a "phantom" image
    slightly shifted from the original.

    just to double check, went to windows and it happens
    there too, so i suspect it is a hardware problem
    regarding some sort of alignment or calibration.
    attached i am sending two small samples to illistrate.
    basically, strong color edges "bleed"

    i played around a bit with gamma, and there are some
    settings that minimize this, but the image always sows
    some lack of "depth" - a contrast autostretch and/or hsv
    autostrectch always brings the bleeding back.

    is this problem fixable in software?
    under linux?
    is it fixable at all?

    the hewlett-packard site has very little info on these
    scanners (or on realigning or recalibrating them). i also
    search the web to no end about this issue. the h-p site
    does mention that one should "lock" the scanner head
    before moving it around, which i believe was not done when
    it was moved stored.

    on a related issue, i just noticed that the windows scanning
    software, "windows imaging, by kodak", would get a noticeably
    "better looking" picture, compared to "autoenhance" in xsane
    (which btw, itself enhances substantially to just plain scanning
    under linux, say with xscanimage without advanced options).
    there was some mention on a new gamma setting of 2.2 when i installed
    the h-p deskscan software (2.8). would this mean i should
    autoenhance and then move the gamma slider to 2.2 for best results?

    by "better" i mean that a couple of images i acquired under windows
    improved very verly little with contrast autostrecth and/or
    hsv autostretch.

    any and all help appreciated for both issues!

    thanks a lot,

    -carlos
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    phantom0.jpg
    phantom1.jpg 

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