specific area scanning by Delphi twain

问题

How i can determine the x,y start and the x,y end of scanning using the Delphi twain library ?

Also How i can set dpi for scan a document.

Thanks.

回答1:

AFAIK, for setting a region to be scanned, you can use TTwainSource.SetImageLayoutFramework method. TDelphiTwain.Source returns available Twain sources.

For DPI, I guess you should first set CapUnits to tuInches using TTwainSource.SetICapUnits method. Then you can set DPI by calling TTwainSource.SetIXResolution and TTwainSource.SetIYResolution methods.

来源：https://stackoverflow.com/questions/4536227/specific-area-scanning-by-delphi-twain