Automatic Size and Skew detection

[Brandon B.]

Based on existing Fujitsu TWAIN Driver settings, there is an option for "Automatic Page Size Detection" on the Fujitsu fi-6130 scanner. See attached Fujitsu TWAIN dialog screenshot.

Is this capability exposed in TWAIN and if so is it settable via NTwain?

I have a business requirement to support a user scanning documents in either letter or legal paper sizes (possibly mixed) but I cannot prompt the user to input the paper size. The scan runs with no GUI. My understanding is that automatic skew will handle this scenario.

I would like to avoid calculating the approximate paper size based on image height to width pixel ratio.

[hangy]

As there seems to be no TWAIN standard capability for descew, this is probably a custom capability. See this article from Atalasoft on how you could find it, and this issue on accessing a custom capability with NTwain.

[Brandon B.]

Thank you for your reply hangy. The tools, Twister & Twirl, from Atalasoft were helpful in finding the capabilities being manipulated by the Fujitsu scanner dialog. Using the 'Monitor' feature of Twirl, I was able to see the two capabilities being used were ICapOverScan (Auto) & ICapAutomaticBorderDetection (True). Setting the supported paper size to U.S. legal handles my scenario.

However, I will still need to evaluate the image height to width pixel ratio when creating PDF pages (letter or legal) when using another library.