public String getOcrImageFormatName() {
        return ocrImageFormatName;
    }
String representation of the image format used to render
the page image for OCR (examples: png, tiff, jpeg)

@return
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-pdf-module/src/main/java/org/apache/tika/parser/pdf/PDFParserConfig.java