I.R.I.S. IRIScompressor Pro Mac - Manual (Page 19)

Using IRISCompressor Pro
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Format
Select the output format you want to generate: PDF or XPS.
Important note: Adobe Reader is recommended to open
compressed PDF files on a mobile OS (e.g. on an iPad or Android
tablet)
OCR

Select Enabled in case you want IRISCompressor to recognize
the text in your images. IRISCompressor will then generate text-
searchable output files. If OCR is disabled, IRISCompressor just
compresses your images without recognizing the text.

Select the required OCR language from the list.