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https://issues.apache.org/jira/browse/PDFBOX-2128?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14335553#comment-14335553
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Tilman Hausherr commented on PDFBOX-2128:
-----------------------------------------
There was a somewhat similar suggestion, see PDFBOX-2591. We already use an
external product for JBIG2. Apache Imaging is not really good enough (see my
comments here some time ago). It seemed to be mostly dead until recently,
although recently there appears to be a resurrection. But twelvemonkeys is
quite alive!
> CMYK images are not supported correctly
> ---------------------------------------
>
> Key: PDFBOX-2128
> URL: https://issues.apache.org/jira/browse/PDFBOX-2128
> Project: PDFBox
> Issue Type: Bug
> Components: PDModel
> Affects Versions: 1.8.5, 1.8.6, 2.0.0
> Environment: Windows 7 Professional
> Running jvm: Java HotSpot(TM) 64-Bit Server VM - 1.6.0_26-b03 - 20.1-b02 -
> Sun Microsystems Inc
> Reporter: Ludovic Davoine
> Labels: PDJpeg, cmyk, images
> Fix For: 2.1.0
>
> Attachments: 573636.pdf, DCTFilter.patch,
> PDFBOX-2128-CAPITAL.pdf-1.png, PDFBOX-2128-CAPITAL.pdf-2.png,
> PDFBOX-2128-PORSCHE_CMYK.pdf-1.png, PDFBOX-2128-PORSCHE_CMYK.pdf-2.png,
> porsche_cmyk.pdf-2.png
>
> Original Estimate: 1h
> Remaining Estimate: 1h
>
> I have a PDF with CMYK images inside and i need to extract the images in the
> RGB format. But the PDJpeg class seems to not work correctly; the colors are
> bad. Example:
> - Original image in te PDF : http://ludoda.free.fr/IMAGE_IN_PDF.jpg
> - Extracted image: http://ludoda.free.fr/IMAGE_EXTRACTED.jpg
> You can download the PDF : http://ludoda.free.fr/PORSCHE_CMYK.PDF
> and try my simple Test Case (I'm using PDFbox 1.8.5):
> {code}
> import java.awt.image.BufferedImage;
> import java.io.File;
> import java.io.IOException;
> import java.util.Iterator;
> import java.util.List;
> import java.util.Map;
> import javax.imageio.ImageIO;
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.pdmodel.PDPage;
> import org.apache.pdfbox.pdmodel.PDResources;
> import org.apache.pdfbox.pdmodel.graphics.xobject.PDJpeg;
> import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObject;
> import org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage;
> public class TestCase {
>
> public static void main(String[] args)
> {
> try
> {
> System.out.println("START EXTRACTING IMAGES...");
> read_pdf();
> System.out.println("COMPLETE");
> }
> catch (IOException ex)
> {
> System.out.println("" + ex);
> }
> }
> public static void read_pdf() throws IOException
> {
> PDDocument document = null;
> document = PDDocument.load("C:\\temp\\PORSCHE_CMYK.pdf");
> @SuppressWarnings("unchecked")
> List<PDPage> pages =
> document.getDocumentCatalog().getAllPages();
> Iterator<PDPage> iter = pages.iterator();
> int i =1;
> while (iter.hasNext())
> {
> PDPage page = (PDPage) iter.next();
> PDResources resources = page.getResources();
> Map<String, PDXObject> pageImages =
> resources.getXObjects();
> if (pageImages != null)
> {
> Iterator<String> imageIter =
> pageImages.keySet().iterator();
> while (imageIter.hasNext())
> {
> String key = (String) imageIter.next();
> if(pageImages.get(key) instanceof
> PDXObjectImage)
> {
> PDJpeg image = (PDJpeg)
> pageImages.get(key);
>
> // Test 1 : write2file
>
> image.write2file("C:\\workspace\\JAVA_PDFTools\\temp\\image" + i);
>
> // Test 2: getRGBImage
> BufferedImage
> bimage=image.getRGBImage();
> File outputfile = new
> File("C:\\workspace\\JAVA_PDFTools\\temp\\image" + i+"_buffered.jpg");
> ImageIO.write(bimage, "jpg",
> outputfile);
> i ++;
> }
> }
> }
> }
> }
> }
> {code}
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