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Sample Kotlin code for using PDFTron SDK to extract images from PDF files, along with their positioning information and DPI. Instead of converting PDF images to a Bitmap, you can also extract uncompressed/compressed image data directly using element.GetImageData() (described in the PDF Data Extraction code sample). Learn more about our Kotlin PDF Library and PDF Parsing & Content Extraction Library.
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//---------------------------------------------------------------------------------------
// Copyright (c) 2001-2019 by PDFTron Systems Inc. All Rights Reserved.
// Consult legal.txt regarding legal and license information.
//---------------------------------------------------------------------------------------
package com.pdftron.android.pdfnetsdksamples.samples
import com.pdftron.android.pdfnetsdksamples.OutputListener
import com.pdftron.android.pdfnetsdksamples.PDFNetSample
import com.pdftron.android.pdfnetsdksamples.R
import com.pdftron.android.pdfnetsdksamples.util.Utils
import com.pdftron.common.PDFNetException
import com.pdftron.pdf.Element
import com.pdftron.pdf.ElementReader
import com.pdftron.pdf.Image
import com.pdftron.pdf.PDFDoc
import java.util.*
///-----------------------------------------------------------------------------------
/// This sample illustrates one approach to PDF image extraction
/// using PDFNet.
///
/// Note: Besides direct image export, you can also convert PDF images
/// to Java image, or extract uncompressed/compressed image data directly
/// using element.GetImageData() (e.g. as illustrated in ElementReaderAdv
/// sample project).
///-----------------------------------------------------------------------------------
class ImageExtractTest : PDFNetSample() {
init {
setTitle(R.string.sample_imageextract_title)
setDescription(R.string.sample_imageextract_description)
// The standard library does not support exporting to
// PNG/TIFF formats, thus trying to export the PDF to
// PNG or TIFF will fail. Please, comment out this call
// if using the full library.
// DisableRun();
}
override fun run(outputListener: OutputListener?) {
super.run(outputListener)
mOutputListener = outputListener
mFileList.clear()
printHeader(outputListener!!)
// Initialize PDFNet
// Example 1:
// Extract images by traversing the display list for
// every page. With this approach it is possible to obtain
// image positioning information and DPI.
// Initialize PDFNet
// Example 1:
// Extract images by traversing the display list for
// every page. With this approach it is possible to obtain
// image positioning information and DPI.
try {
val doc = PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf")!!.absolutePath)
doc.initSecurityHandler()
val reader = ElementReader()
// Read every page
val itr = doc.pageIterator
while (itr.hasNext()) {
reader.begin(itr.next())
ImageExtract(reader)
reader.end()
}
doc.close()
mOutputListener!!.println("Done.")
} catch (e: Exception) {
mOutputListener!!.printError(e.stackTrace)
}
mOutputListener!!.println("----------------------------------------------------------------")
// Example 2:
// Extract images by scanning the low-level document.
// Example 2:
// Extract images by scanning the low-level document.
try {
val doc = PDFDoc(Utils.getAssetTempFile(INPUT_PATH + "newsletter.pdf")!!.absolutePath)
doc.initSecurityHandler()
image_counter = 0
val cos_doc = doc.sdfDoc
val num_objs = cos_doc.xRefSize()
for (i in 1 until num_objs) {
val obj = cos_doc.getObj(i)
if (obj != null && !obj.isFree && obj.isStream) {
// Process only images
var itr = obj.find("Type")
if (!itr.hasNext() || itr.value().name != "XObject") continue
itr = obj.find("Subtype")
if (!itr.hasNext() || itr.value().name != "Image") continue
val image = Image(obj)
mOutputListener!!.println("--> Image: " + ++image_counter)
mOutputListener!!.println(" Width: " + image.imageWidth)
mOutputListener!!.println(" Height: " + image.imageHeight)
mOutputListener!!.println(" BPC: " + image.bitsPerComponent)
val fname = "image_extract2_$image_counter"
val path = Utils.createExternalFile(fname, mFileList).absolutePath
image.export(path)
//String path= Utils.createExternalFile(fname + ".tif", mFileList).getAbsolutePath();
//image.exportAsTiff(path);
//String path = Utils.createExternalFile(fname + ".png", mFileList).getAbsolutePath();
//image.exportAsPng(path);
}
}
doc.close()
mOutputListener!!.println("Done.")
} catch (e: Exception) {
mOutputListener!!.printError(e.stackTrace)
}
for (file in mFileList) {
addToFileList(file!!)
}
printFooter(outputListener!!)
}
companion object {
private var mOutputListener: OutputListener? = null
private val mFileList = ArrayList<String>()
// Relative paths to folders containing test files.
internal var image_counter = 0
@Throws(PDFNetException::class)
fun ImageExtract(reader: ElementReader) {
var element: Element
while (reader.next().also { element = it } != null) {
when (element.type) {
Element.e_image, Element.e_inline_image -> {
mOutputListener!!.println("--> Image: " + ++image_counter)
mOutputListener!!.println(" Width: " + element.imageWidth)
mOutputListener!!.println(" Height: " + element.imageHeight)
mOutputListener!!.println(" BPC: " + element.bitsPerComponent)
val ctm = element.ctm
val x2 = 1.0
val y2 = 1.0
val p = ctm.multPoint(x2, y2)
mOutputListener!!.println(String.format(" Coords: x1=%.2f, y1=%.2f, x2=%.2f, y2=%.2f", ctm.h, ctm.v, p.x, p.y))
if (element.type == Element.e_image) {
val image = Image(element.xObject)
val fname = "image_extract1_$image_counter"
val path = Utils.createExternalFile(fname, mFileList).absolutePath
image.export(path)
//String path2 = Utils.createExternalFile(fname + ".tif", mFileList).getAbsolutePath();
//image.exportAsTiff(path2);
//String path3 = Utils.createExternalFile(fname + ".png", mFileList).getAbsolutePath();
//image.exportAsPng(path3);
}
}
Element.e_form -> {
reader.formBegin()
ImageExtract(reader)
reader.end()
}
}
}
}
}
}