'Check text orientation' means that pages that were scanned in the wrong direction are rotated so that OCR is possible. 'Clean page (e.g. delete background pattern)' deletes screen dots that otherwise would get in the way of text recognition. The option 'Suppress minimal scaling to 300dpi' prevents pages that exist in a weaker resolution from being extrapolated to a minimum of 300dpi. 'Process without black and white conversion' means that pages in gray scales or color are not converted but recognized as such.