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TWAIN and Epson V700 – how to make it scan the entire width

Forums › TWAIN Classic › TWAIN and Epson V700 – how to make it scan the entire width

  • This topic has 3 replies, 2 voices, and was last updated 8 years, 1 month ago by spike.
Viewing 4 posts - 1 through 4 (of 4 total)
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  • November 13, 2012 at 1:12 pm #22795 Reply
    kmp
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    • Topics - 1
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    • Total Posts - 2

    Hi,

    I asked a question over on Stack Overflow here: http://stackoverflow.com/q/13357297/1039947 and then I came across this website so I am hoping that someone here may be able to help me, here is the problem…

    I am setting the layout in order to scan just a small part of a page and I am using an Epson Perfection V700 scanner (this code works fine on various other scanners). What it does is it cuts off the left and right edges of the scanning area – it seems that it is only allowing me to scan 6 inches in the middle. If I use the tool that comes with it I can scan the entire area with the light on but not using TWAIN.

    If I turn the light off, the layout works fine.

    Is there any TWAIN setting I can use to force the scanner to scan the entire page width and have the light on?

    December 18, 2012 at 9:59 pm #25727 Reply
    spike
    Participant
    • Topics - 10
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    when you say “with the light on”… what do you mean exactly?

    December 19, 2012 at 7:40 am #25728 Reply
    kmp
    Participant
    • Topics - 1
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    • Total Posts - 2

    I mean with the backlight turned on (LightPath set to 1 – i.e. transmissive, see: http://www.data-tech.com/help/imnettwain/Twain%20Capabilities.html).

    December 19, 2012 at 3:51 pm #25729 Reply
    spike
    Participant
    • Topics - 10
    • Replies - 139
    • Total Posts - 149

    Ah. You’re scanning in transparency mode.
    Maybe Epson is assuming that there is no point scanning outside the edges of their transparency adapter(s)?

    I would look at maybe IMAGELAYOUT, what is its value after you set LightPath=1.
    That’s the most common way in TWAIN, to represent a constrained scan area – a ‘region of interest’.

    But it sounds like you might be already setting that. Hmm.
    Have you looked at the values of ICAP_XSCALE and ICAP_YSCALE? Are they maybe not equal to 1?

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Reply To: TWAIN and Epson V700 – how to make it scan the entire width
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