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https://issues.apache.org/jira/browse/PDFBOX-3400?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tilman Hausherr closed PDFBOX-3400.
-----------------------------------
Resolution: Duplicate
That PDF has transparency groups :-( Duplicate of PDFBOX-3000.
> Gradient/Shading color alpha stepping do not work correctly
> -----------------------------------------------------------
>
> Key: PDFBOX-3400
> URL: https://issues.apache.org/jira/browse/PDFBOX-3400
> Project: PDFBox
> Issue Type: Bug
> Components: Parsing
> Affects Versions: 1.8.12, 2.0.2
> Environment: Mac OS X, Maven repos
> Reporter: Jedrzej Majko
> Labels: alpha, shading
>
> Gradient created in illustrator with stepping to color with opacity do not
> render properly in PDFBox.
> Rectangle below sh added to test proper rendering.
> PDF (v 1.5, Adobe Illustrator CS5.1):
> http://u2.home.pl/gradients2.pdf
> Correct rendering (using pdf.js):
> http://u2.home.pl/correctrender.png
> PDFBox rendering (using PdfRenderer.renderImageWithDPI):
> http://u2.home.pl/pdfboxresult.png
> What I noticed is that pdf.js have two sh operands during parsing, when
> PDFBox returns one via PDFGraphicsStreamEngine.
> Tested on 2.0.2 and 1.8.12.
> Code used to generate pdfboxresult.png:
> import org.apache.pdfbox.pdmodel.PDDocument;
> import org.apache.pdfbox.rendering.ImageType;
> import org.apache.pdfbox.rendering.PDFRenderer;
> import org.apache.pdfbox.tools.imageio.ImageIOUtil;
> import java.awt.image.BufferedImage;
> import java.io.*;
> public class Test {
> public static void main(String[] args) throws IOException {
> PDDocument document = PDDocument.load(new File("gradients2.pdf"));
> PDFRenderer pdfRenderer = new PDFRenderer(document);
> for (int page = 0; page < document.getNumberOfPages(); ++page)
> {
> BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300,
> ImageType.ARGB);
> ImageIOUtil.writeImage(bim, "pdfboxresult.png", 300);
> break;
> }
> document.close();
> }
> }
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