[
https://issues.apache.org/jira/browse/PDFBOX-5051?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17251696#comment-17251696
]
Tilman Hausherr edited comment on PDFBOX-5051 at 4/24/21, 11:05 AM:
--------------------------------------------------------------------
Using {{setRGB}} brings a perfect rendering for Ghent workgroup 5.0 testcase
17.0 (page 3), the "X" is no longer visible. And also two perfect renderings of
the middle squares for testcase 23.0 (page 5), and a better rendering for the
black area in PDFBOX-3556.
This suggests that {{setRGB}} might be gold standard. I get the same result by
changing the construction of ColorConvertOp to this:
{code}
renderingHints = new RenderingHints(null);
renderingHints.put(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
renderingHints.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
ColorConvertOp op = new ColorConvertOp(new ICC_Profile[0], renderingHints);
op.filter(src, dest);
{code}
Using this brings total rendering time to 300 secs. Your file is still slow.
Update 22.4.2021: the modified ColorConvertOp brings no improvement at all, I
wonder if I made a mistake when I tested. A look in the source code shows that
the RenderingHints aren't used.
was (Author: tilman):
Using {{setRGB}} brings a perfect rendering for Ghent workgroup 4.0 testcase
17.0, the "X" is no longer visible. And also two perfect renderings of the
middle squares for Ghent workgroup 5.0 testcase 23.0, and a better rendering
for the black area in PDFBOX-3556.
This suggests that {{setRGB}} might be gold standard. I get the same result by
changing the construction of ColorConvertOp to this:
{code}
renderingHints = new RenderingHints(null);
renderingHints.put(RenderingHints.KEY_INTERPOLATION,
RenderingHints.VALUE_INTERPOLATION_BICUBIC);
renderingHints.put(RenderingHints.KEY_RENDERING,
RenderingHints.VALUE_RENDER_QUALITY);
ColorConvertOp op = new ColorConvertOp(new ICC_Profile[0], renderingHints);
op.filter(src, dest);
{code}
Using this brings total rendering time to 300 secs. Your file is still slow.
Update 22.4.2021: the modified ColorConvertOp brings no improvement at all, I
wonder if I made a mistake when I tested. A look in the source code shows that
the RenderingHints aren't used.
> Slow rendering for specific PDF file
> ------------------------------------
>
> Key: PDFBOX-5051
> URL: https://issues.apache.org/jira/browse/PDFBOX-5051
> Project: PDFBox
> Issue Type: Bug
> Components: Rendering
> Affects Versions: 2.0.21
> Environment: Amazon Coretto jdk11.0.3_7, OpenJDK 15
> Reporter: Stefan Mueller
> Priority: Major
> Attachments: slowpdfbox.pdf
>
>
> Doing PDF rendering upon the document being attached is rather slow.
> It takes 18 seconds on a Core i7 machine with 32 GB of RAM and no maximum
> being imposed upon the JVM.
> {code:java}
> System.setProperty("sun.java2d.cmm",
> "sun.java2d.cmm.kcms.KcmsServiceProvider");
> long ms = System.currentTimeMillis();
> try (final PDDocument document = PDDocument.load(new
> File("C:\\temp\\slowpdfbox.pdf")))
> {
> ms = System.currentTimeMillis() -ms;
> System.out.println("Took " + ms + " milliseconds for loading");
>
> PDFRenderer pdfRenderer = new PDFRenderer(document);
> pdfRenderer.setSubsamplingAllowed(true);
> for (int page = 0; page < 1; ++page)
> {
> ms = System.currentTimeMillis();
> BufferedImage bim = pdfRenderer.renderImageWithDPI(page, 300, ImageType.RGB);
>
> ms = System.currentTimeMillis() -ms;
> System.out.println("Took " + ms + " milliseconds for rendering");
>
>
> String fileName = "c:\\temp\\test.jpg";
> ImageIOUtil.writeImage(bim, fileName, 300); //<---this number
> }
> document.close();
> }
> catch (IOException e){
> System.err.println("Exception while reading pdf document - " + e);
> }
> {code}
> Console Output:
> Took 262 milliseconds for loading
> Dez. 18, 2020 6:25:15 VORM.
> org.apache.pdfbox.pdmodel.graphics.color.PDICCBased ensureDisplayProfile
> WARNUNG: ICC profile is Perceptual, ignoring, treating as Display class
> Took 17914 milliseconds for rendering
>
>
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
---------------------------------------------------------------------
To unsubscribe, e-mail: [email protected]
For additional commands, e-mail: [email protected]
