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Date Posted: 19:12:45 04/28/05 Thu
Author: Wade Auchterlonie
Subject: Scanned Does 2 Passes With TWAIN

On XP, with an HP 4570C scanner, when the image is acquired the scanner does two passes and the image is transferred both times to the OnAcquire event.

These two passes are in addition to the preview scan. That is, they happen after clicking the "Accept" button to begin the scan/transfer.

Interestingly enough, this does not happen with the WIA driver, only with the TWAIN driver.

Is this a software issue?

The HP scanner driver is the latest version.

This is reproducable with the demo app.


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