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https://issues.apache.org/jira/browse/PDFBOX-5091?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17277796#comment-17277796
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Volker Ullmann edited comment on PDFBOX-5091 at 2/3/21, 8:17 AM:
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Here is our code, a little bit simplified, it has not changed from 2.0.20 to
2.0.22:
{code:java}
final int maxImageWidth = 1280;
final MemoryUsageSetting memoryUsageSetting =
MemoryUsageSetting.setupMainMemoryOnly();
byte[] pdfContent = loadPdfContent(); // get the bytes of the PDF file
try (PDDocument document = PDDocument.load(new
ByteArrayInputStream(pdfContent),
memoryUsageSetting)) {
PDPage firstPage = document.getPage(0);
PDFRenderer pdfRenderer = new PDFRenderer(document);
pdfRenderer.setSubsamplingAllowed(true);
PDRectangle cropBox = firstPage.getCropBox();
float scale = maxImageWidth / cropBox.getWidth();
BufferedImage image = pdfRenderer.renderImage(0, scale);
// ...
} catch (Exception ex) {
// ...
}
{code}
OS is Windows 10 and the JDK is
java.runtime.version = 1.8.0_261-b12
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
java.vm.vendor = Oracle Corporation
was (Author: vul):
Here is our code, a little bit simplified, it has not changed from 2.0.20 to
2.0.22:
{code:java}
final int maxImageWidth = 1280;
final MemoryUsageSetting memoryUsageSetting =
MemoryUsageSetting.setupMainMemoryOnly(); byte[] pdfContent = loadPdfContent();
// get the bytes of the PDF file
try (PDDocument document =
PDDocument.load(new ByteArrayInputStream(pdfContent),
memoryUsageSetting)) {
PDPage firstPage = document.getPage(0);
PDFRenderer pdfRenderer = new PDFRenderer(document);
pdfRenderer.setSubsamplingAllowed(true);
PDRectangle cropBox = firstPage.getCropBox();
float scale = maxImageWidth / cropBox.getWidth();
BufferedImage image = pdfRenderer.renderImage(0, scale);
// ...
} catch (Exception ex) {
// ...
}
{code}
OS is Windows 10 and the JDK is
java.runtime.version = 1.8.0_261-b12
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
java.vm.vendor = Oracle Corporation
> Performance issue when saving PDF to image after upgrading from PDFBox 2.0.20
> to 2.0.21
> ---------------------------------------------------------------------------------------
>
> Key: PDFBOX-5091
> URL: https://issues.apache.org/jira/browse/PDFBOX-5091
> Project: PDFBox
> Issue Type: Bug
> Environment: JDK 8 on Windows10
> Reporter: Volker Ullmann
> Priority: Minor
> Attachments: single_page.pdf
>
>
> We use PDFBox to save the first page of a PDF as an image to provide a
> preview of the document. These PDFs can be relatively complex as they may
> contain ten thousands of objects, especially map data. The results are still
> fine, but when we upgraded from 2.0.20 to 2.0.21 we had a notable performance
> decrease. Saving the first page of the attached sample document now takes
> nearly 20 sec on my developer machine, compared to 4 sec with 2.0.20.
>
>
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