I.R.I.S. IRIScompressor Pro Mac - Manual (Page 16)

IRISCompressor TM Pro – User Guide
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The OCR language is set to the language you selected during
installation. Click the language icon to select a different language.
Note: other languages are only available if you selected them during
installation. In case no other languages are available or you need
different languages, remove and reinstall IRISCompressor and
select other OCR languages. You can install a maximum of 5
languages.
Note: make sure the OCR language you select corresponds to the
language of your files. Selecting the wrong language will lead to
unsatisfactory OCR results.
Step 4: Selecting Advanced options

Select Auto Deskew in case you are processing images that are
not entirely straight - or "skewed". The Auto Deskew option
straightens your images.
Note: the skew angle may not exceed 10 degrees.

Select Auto Orientation in case you are processing a
combination of images with vertical text and images with
horizontal text. The Auto Orientation option rotates all images
to the same direction.