I'm trying to build an application implementing DotTwain and using pre-set dimensions.

 If I set
     this.device.HideInterface = false;
then the custom setting which I've pre-set is already selected. All I need to do is click Scan on the device's interface and the image is scanned as I'd expect.

If I set
    this.device.HideInterface = true;
then the custom settings are ignored and the device scans with different settings.

So my question is how do I configure my DotTwain application to use these custom scan settings without showing the device interface?

Those custom settings are specific to the scanner and not part of the TWAIN specification.  You can do something similar using the SaveXmlParameters and LoadXmlParameters methods to save the current scanner settings and load them later.

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Glenn Chittenden Jr.
Atalasoft Development Team