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Use this function to save the picture of the signature (without the background picture if set) to a file specified in pic. You may set the filname to *.bmp or *.jpg. There are Options to enable cropping and stretching of the signature image, they have to be set before startCatpure, see Driver Options.
Important: call this before you call stopRead. StopRead is deleting the picture of the last signature.
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