There are many reasons why TOCR may not be able to process a particular image that are common to all OCR engines, and are an ongoing challenge for OCR in general. In particular, noise, faint or broken characters, overly bold or black characters, merged characters, and text embedded within a picture can decrease accuracy. Whilst TOCR is an extremely accurate OCR engine, it will not get everything right. See our OCR Tips page for more information, and advice on improving results.