This event is raised before the OCR process starts, and after ImageSendOff for OCR
Atalasoft.dotImage.Ocr (in Atalasoft.dotImage.Ocr.dll) Version: 220.127.116.11.0.297 (.NET 4.5.2, x86)
Any processing of the image in this event handler has no effect on the image that's included in a
searchable PDF or other "Hidden Text Behind Image" formats. It is reasonable to threshold a color image to
bi-tonal, and to strip away non-text content in this handler.