title: How to parse images using tika-app-*.jar?
body: <p>I downloaded <code>tika-app-1.18.jar</code>, <code>jdk-8u181-linux-i586.tar.gz</code>, then extracted <code>jdk-8u181-linux-i586.tar.gz</code> and exported it's <code>bin</code> path in <code>PATH</code> environment variable. When I try to parse text in an image, it shows metadata of given file with some warnings but without any text in given image. When I pass some text file instead of image, it works fine. Does <code>tika-app-1.18.jar</code> requires other <code>.jar</code> files to parse images?</p>
  
  <p>Output of some commands is as given below:</p>
  
  <pre><code>#java -version
  java version "1.8.0_181"
  Java(TM) SE Runtime Environment (build 1.8.0_181-b13)
  Java HotSpot(TM) Server VM (build 25.181-b13, mixed mode)
  </code></pre>
  
  <hr>
  
  <pre><code>#java -jar tika-app-1.18.jar --version
  Sep 19, 2018 12:19:09 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: J2KImageReader not loaded. JPEG2000 files will not be processed.
  See https://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
  for optional dependencies.
  
  Sep 19, 2018 12:19:10 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: Tesseract OCR is installed and will be automatically applied to image files unless
  you've excluded the TesseractOCRParser from the default parser.
  Tesseract may dramatically slow down content extraction (TIKA-2359).
  As of Tika 1.15 (and prior versions), Tesseract is automatically called.
  In future versions of Tika, users may need to turn the TesseractOCRParser on via TikaConfig.
  Sep 19, 2018 12:19:10 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: org.xerial's sqlite-jdbc is not loaded.
  Please provide the jar on your classpath to parse sqlite files.
  See tika-parsers/pom.xml for the correct version.
  Apache Tika 1.18
  </code></pre>
  
  <hr>
  
  <pre><code>#java -jar tika-app-1.18.jar images/nitin.png -t
  Sep 19, 2018 12:19:45 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: J2KImageReader not loaded. JPEG2000 files will not be processed.
  See https://pdfbox.apache.org/2.0/dependencies.html#jai-image-io
  for optional dependencies.
  
  Sep 19, 2018 12:19:46 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: Tesseract OCR is installed and will be automatically applied to image files unless
  you've excluded the TesseractOCRParser from the default parser.
  Tesseract may dramatically slow down content extraction (TIKA-2359).
  As of Tika 1.15 (and prior versions), Tesseract is automatically called.
  In future versions of Tika, users may need to turn the TesseractOCRParser on via TikaConfig.
  Sep 19, 2018 12:19:46 PM org.apache.tika.config.InitializableProblemHandler$3 handleInitializableProblem
  WARNING: org.xerial's sqlite-jdbc is not loaded.
  Please provide the jar on your classpath to parse sqlite files.
  See tika-parsers/pom.xml for the correct version.
  &lt;?xml version="1.0" encoding="UTF-8"?&gt;&lt;html xmlns="http://www.w3.org/1999/xhtml"&gt;
  &lt;head&gt;
  &lt;meta name="Transparency Alpha" content="none"/&gt;
  &lt;meta name="tiff:ImageLength" content="460"/&gt;
  &lt;meta name="Compression CompressionTypeName" content="deflate"/&gt;
  &lt;meta name="Data BitsPerSample" content="8 8 8"/&gt;
  &lt;meta name="Data PlanarConfiguration" content="PixelInterleaved"/&gt;
  &lt;meta name="Dimension VerticalPixelSize" content="0.26462027"/&gt;
  &lt;meta name="IHDR" content="width=819, height=460, bitDepth=8, colorType=RGB, compressionMethod=deflate, filterMethod=adaptive, interlaceMethod=none"/&gt;
  &lt;meta name="Chroma ColorSpaceType" content="RGB"/&gt;
  &lt;meta name="Content-Length" content="6837"/&gt;
  &lt;meta name="tiff:BitsPerSample" content="8 8 8"/&gt;
  &lt;meta name="Content-Type" content="image/png"/&gt;
  &lt;meta name="height" content="460"/&gt;
  &lt;meta name="gAMA" content="45455"/&gt;
  &lt;meta name="X-Parsed-By" content="org.apache.tika.parser.DefaultParser"/&gt;
  &lt;meta name="X-Parsed-By" content="org.apache.tika.parser.ocr.TesseractOCRParser"/&gt;
  &lt;meta name="X-Parsed-By" content="org.apache.tika.parser.image.ImageParser"/&gt;
  &lt;meta name="pHYs" content="pixelsPerUnitXAxis=3779, pixelsPerUnitYAxis=3779, unitSpecifier=meter"/&gt;
  &lt;meta name="Chroma Gamma" content="0.45455"/&gt;
  &lt;meta name="Dimension PixelAspectRatio" content="1.0"/&gt;
  &lt;meta name="resourceName" content="nitin.png"/&gt;
  &lt;meta name="sRGB" content="Perceptual"/&gt;
  &lt;meta name="Compression NumProgressiveScans" content="1"/&gt;
  &lt;meta name="Dimension HorizontalPixelSize" content="0.26462027"/&gt;
  &lt;meta name="Chroma BlackIsZero" content="true"/&gt;
  &lt;meta name="Compression Lossless" content="true"/&gt;
  &lt;meta name="width" content="819"/&gt;
  &lt;meta name="Dimension ImageOrientation" content="Normal"/&gt;
  &lt;meta name="tiff:ImageWidth" content="819"/&gt;
  &lt;meta name="Chroma NumChannels" content="3"/&gt;
  &lt;meta name="Data SampleFormat" content="UnsignedIntegral"/&gt;
  &lt;title/&gt;
  &lt;/head&gt;
  &lt;body/&gt;&lt;/html&gt;
  </code></pre>