Re: Gamma correction for HP

From: Oliver Rauch (oliver.rauch@Wolfsburg.DE)
Date: Fri Apr 14 2000 - 06:21:42 PDT

  • Next message: Michael Zapf: "Re: Gamma correction for HP"

    Michael Zapf wrote:

    > I am using a HP ScanJet 4p with sane. The images from the scanner have a slight
    > blue-green tint. By using a calibration image I found out that the gamma curves
    > need to be adjusted; especially the red one must be raised in the mid-tones.
    >
    > xscanimage offers a device dialog with the "custom gamma table" selection.
    > However, I can only adjust "image intensity", not the separate color channels;
    > there are no selections for them. Although the adjustment greatly enhanced the
    > quality, the image is still tinted green-blue.
    >
    > Are those selections dependend on the scanner backend? (I'm using sane-hp). Does
    > the HP backend not allow separate color gamma adjustments?
    >

    Hi Michael,

    I don`t know the HP backend, but xsane is able to do what you want in software (and hardware
    if supported).
    Take a look at my homepage.

    Bye
    Oliver 

    --
Homepage:       http://www.wolfsburg.de/~rauch
sane-umax:      http://www.wolfsburg.de/~rauch/sane/sane-umax.html
xsane:          http://www.wolfsburg.de/~rauch/sane/sane-xsane.html
E-Mail:         mailto:Oliver.Rauch@Wolfsburg.DE

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