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

[kmp]

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?

[spike]

when you say “with the light on”… what do you mean exactly?

[kmp]

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).

[spike]

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?

[Author]

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