sample-configs/customocr/tika-config-rendered.xml

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
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  ~    http://www.apache.org/licenses/LICENSE-2.0
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  -->
<properties>
  <parsers>     
        <!-- Load TesseractOCRParser (could use DefaultParser if you want others too) -->
        <parser class="org.apache.tika.parser.ocr.TesseractOCRParser"/>   

        <!-- OCR on Rendered Pages -->
        <parser class="org.apache.tika.parser.pdf.PDFParser">
            <params>
                <!-- no_ocr - extract text only
                     ocr_only - don't extract text and just attempt OCR
                     ocr_and_text - extract text and attempt OCR (from Tika 1.24)
                     auto - extract text but if < 10 characters try OCR
                -->
                <param name="ocrStrategy" type="string">ocr_only</param>
                <param name="ocrImageType" type="string">rgb</param>
                <param name="ocrDPI" type="int">100</param>
            </params>
        </parser>

  </parsers>
</properties>