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https://issues.apache.org/jira/browse/PDFBOX-4121?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16375991#comment-16375991
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Tilman Hausherr commented on PDFBOX-4121:
-----------------------------------------
The loading of the image itself is slow:
{code}
ImageReader reader =
ImageIO.getImageReadersByFormatName("JPEG2000").next();
FileInputStream input = new FileInputStream("PDFBOX-4121.jp2");
ImageInputStream iis = ImageIO.createImageInputStream(input);
reader.setInput(iis, true, true);
reader.read(0);
{code}
this takes a long time when read from a stream. Not when read from a file. And
not with this small modification:
{code}
ImageReader reader =
ImageIO.getImageReadersByFormatName("JPEG2000").next();
FileInputStream input = new FileInputStream("PDFBOX-4121.jp2");
ImageInputStream iis = new MemoryCacheImageInputStream(input);
reader.setInput(iis, true, true);
reader.read(0);
{code}
It turns out that java was providing a {{FileCacheImageInputStream}}.
> (-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true) takes much time
> ------------------------------------------------------------------------------
>
> Key: PDFBOX-4121
> URL: https://issues.apache.org/jira/browse/PDFBOX-4121
> Project: PDFBox
> Issue Type: Improvement
> Components: Rendering
> Affects Versions: 2.0.8
> Reporter: savan patel
> Priority: Major
> Labels: DeviceCMYK
> Attachments: 5a55177653dee.pdf
>
>
> I have a pdf in which page 1 gets around 45 sec to render when i set the
> property (-Dorg.apache.pdfbox.rendering.UsePureJavaCMYKConversion=true) and
> without it it takes 20 sec.
> and something weird happens to me. when i don't set this property
> (System.setProperty("sun.java2d.cmm",
> "sun.java2d.cmm.kcms.KcmsServiceProvider")) then i get this warning "WARNING:
> Could not read JPEG 2000 (JPX) image" . is it some jar related warning or it
> happen to u also?
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