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https://issues.apache.org/jira/browse/PDFBOX-3885?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Andreas Lehmkühler closed PDFBOX-3885.
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Resolution: Not A Problem
> Get wrong image location
> ------------------------
>
> Key: PDFBOX-3885
> URL: https://issues.apache.org/jira/browse/PDFBOX-3885
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.7
> Environment: osx, java8
> Reporter: Sun Peter
> Assignee: Andreas Lehmkühler
> Labels: how-to
> Attachments: src.pdf
>
>
> I'm using below code to extract images to an XML file.
> {code:java}
> public class ImageExtractor extends PDFStreamEngine {
> private List<Image> images = new ArrayList<>();
> public ImageExtractor() {
> addOperator(new Concatenate());
> addOperator(new DrawObject());
> addOperator(new SetGraphicsStateParameters());
> addOperator(new Save());
> addOperator(new Restore());
> addOperator(new SetMatrix());
> }
> /**
> * This is used to handle an operation.
> *
> * @param operator The operation to perform.
> * @param operands The list of arguments.
> * @throws IOException If there is an error processing the operation.
> */
> @Override
> protected void processOperator(Operator operator, List<COSBase> operands)
> throws IOException {
> String operation = operator.getName();
> if ("Do".equals(operation)) {
> COSName objectName = (COSName) operands.get(0);
> PDXObject xobject = getResources().getXObject(objectName);
> if (xobject instanceof PDImageXObject) {
> PDImageXObject image = (PDImageXObject) xobject;
> String name = objectName.getName();
> String format = image.getSuffix();
> Matrix ctmNew =
> getGraphicsState().getCurrentTransformationMatrix();
> float imageWidth = ctmNew.getScalingFactorX();
> float imageHeight = ctmNew.getScalingFactorY();
> // position in user space units. 1 unit = 1/72 inch at 72 dpi
> float x = ctmNew.getTranslateX();
> float y = ctmNew.getTranslateY();
> ByteArrayOutputStream bos = new ByteArrayOutputStream();
> BufferedImage bufferedImage = image.getOpaqueImage();
> ImageIO.write(bufferedImage, format, bos);
> images.add(new Image(x, y, imageWidth, imageHeight, name,
> format, bos.toByteArray()));
> }
> } else {
> super.processOperator(operator, operands);
> }
> }
> public byte[] toZipFile(PDDocument doc) throws IOException {
> int pageNum = 0;
> StringBuilder builder = new StringBuilder("<?xml version=\"1.0\"
> encoding=\"UTF-8\"?>\n<document>\n");
> ByteArrayOutputStream bos = new ByteArrayOutputStream();
> ZipOutputStream zipOut = new ZipOutputStream(bos);
> try {
> for (PDPage page : doc.getPages()) {
> builder.append(String.format("<page width=\"%f\"
> height=\"%f\">\n", page.getBBox().getWidth(), page.getBBox().getHeight()));
> pageNum++;
> this.processPage(page);
> for (Image image : images) {
> byte[] data = image.getData();
> ZipEntry zipEntry = new ZipEntry(image.getName() + "." +
> image.getFormat());
> zipOut.putNextEntry(zipEntry);
> zipOut.write(data);
> builder.append(String.format("<image x=\"%f\" y=\"%f\"
> width=\"%f\" height=\"%f\" name=\"%s\" format=\"%s\"></image>\n",
> image.getX(), image.getY(), image.getWidth(), image.getHeight(),
> image.getName(), image.getFormat()));
> }
> builder.append("</page>\n");
> }
> builder.append("</document>");
> System.out.println(builder);
> ZipEntry xmlFile = new ZipEntry("images.xml");
> zipOut.putNextEntry(xmlFile);
>
> zipOut.write(builder.toString().getBytes(Charset.defaultCharset()));
> } finally {
> zipOut.close();
> }
> return bos.toByteArray();
> }
> }
> {code}
> Output is below. the y location is wrong. it should be 434.
> {code:xml}
> <document>
> <page width="595.000000" height="842.000000">
> <image x="48.000000" y="108.000000" width="315.000000" height="300.000000"
> name="Im12" format="jpg"></image>
> </page>
> </document>
> {code}
> I got the right output with poppler.
> {code:xml}
> <image top="434" left="48" width="315" height="300" src="src-1_1.jpg"/>
> {code}
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