Background recognition is enabled by default and starts automatically when you open a PDF
document without a text layer.
The background recognition process cannot run on computers with a single–core processor.
The background recognition process does not change a PDF document's type, so if you save an
image–only document and open it in another application, you will no longer be able to search it and
copy its content.
To make a PDF document searchable you need to add a text layer to it. See
for more information.
If the search or copy functions don't work properly, check if the document's languages are specified
correctly. See Recognition languages for more information.
You can disable the background recognition process at any time by clearing the Enable
copying and full–text searches in raster documents without a text layer check box in
the Preferences… dialog box.
ABBYY PDF Transformer+ can enhance the quality of PDF documents created from image files.
Depending on the type of input images, the program will automatically choose and apply the
necessary corrections to remove such defects as skew, uneven text lines or wrong resolution.
ABBYY PDF Transformer+ can also correct page orientation and make characters look smoother with
ABBYY PreciseScan technology.
When a PDF document with a digital signature is enhanced, the signature becomes a bitmap
You can specify enhancement options in the Image Enhancement dialog box (File>Enhance
Correct page orientation
Select this option to automatically correct page orientation. In order for a page to be recognized, it
must have the correct orientation: text lines must be horizontal and text must read from top to
Apply ABBYY PreciseScan to smooth characters on image
Selecting this option enables ABBYY PreciseScan, an image processing technology that smoothes
characters on a document so that they do not become pixilated when you zoom in.
Applying ABBYY PreciseScan may increase the size of the resulting file. To reduce the
size of the file, select Reduce File Size… from the File menu.
ABBYY PDF Transformer+ lets you stamp PDF files in the same manner as you stamp paper
documents. You can select a stamp from the list of available stamps or create your own, adding any
text you need, together with the data and time of stamping.