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From Tilman Hausherr <THaush...@t-online.de>
Subject Re: OutOfMemoryError thrown when rendering a small scanned PDF file with 600 dpi
Date Tue, 20 Dec 2016 11:16:39 GMT
Am 19.12.2016 um 20:34 schrieb Michael Ng:
> Hi everyone,
>
> First of all, thank the effort of the developers for PDFBox.
>
> I encounter an OutOfMemory problem when rendering images in 600 dpi scanned PDF files.
Here are 2 sample one-page files (with 45KB and 517 KB respectively):
> https://drive.google.com/open?id=0B9p0h5LPh-3FQTZ0OGhoYkpMUjg
> https://drive.google.com/open?id=0B9p0h5LPh-3FRUxhT0RJRl9FekE
>
> The file size is not large, but rendering it will take up more than 256Mb of the memory
and throw an error. If I tell Java VM to allocate more memory by passing the -Xmx parameter,
the image will be rendered successfully. (There also seems to be no problem for scanned files
with 300 dpi or below.)
>
> I would like to know whether this is a known issue. Why would rendering of a small one-page
scanned PDF file take up so much memory?
> Is there any way to get around this memory issue?

This isn't really an issue - this is expected. Images are expanded 
internally, so a 600dpi image will use a lot of space. A 300dpi will use 
4 times as much space as a 600dpi image.

You don't really need 600dpi, unless you want high quality OCR. My 
clients request 200 or 300dpi.

Tilman


> The following is the error message:
> Exception in thread "ViewerLoadDocumentThread" java.lang.OutOfMemoryError: Java heap
space
>         at java.awt.image.DataBufferByte.<init>(DataBufferByte.java:92)
>         at java.awt.image.ComponentSampleModel.createDataBuffer(ComponentSampleModel.java:445)
>         at sun.awt.image.ByteInterleavedRaster.<init>(ByteInterleavedRaster.java:90)
>         at sun.awt.image.ByteInterleavedRaster.createCompatibleWritableRaster(ByteInterleavedRaster.java:1281)
>         at sun.awt.image.ByteInterleavedRaster.createCompatibleWritableRaster(ByteInterleavedRaster.java:1292)
>         at org.apache.pdfbox.filter.DCTFilter.fromBGRtoRGB(DCTFilter.java:246)
>         at org.apache.pdfbox.filter.DCTFilter.decode(DCTFilter.java:171)
>         at org.apache.pdfbox.cos.COSInputStream.create(COSInputStream.java:69)
>         at org.apache.pdfbox.cos.COSStream.createInputStream(COSStream.java:162)
>         at org.apache.pdfbox.pdmodel.common.PDStream.createInputStream(PDStream.java:235)
>         at org.apache.pdfbox.pdmodel.graphics.image.PDImageXObject.<init>(PDImageXObject.java:160)
>         at org.apache.pdfbox.pdmodel.graphics.PDXObject.createXObject(PDXObject.java:70)
>         at org.apache.pdfbox.pdmodel.PDResources.getXObject(PDResources.java:409)
>         at org.apache.pdfbox.contentstream.operator.graphics.DrawObject.process(DrawObject.java:53)
>         at org.apache.pdfbox.contentstream.PDFStreamEngine.processOperator(PDFStreamEngine.java:829)
>         at org.apache.pdfbox.contentstream.PDFStreamEngine.processStreamOperators(PDFStreamEngine.java:486)
>         at org.apache.pdfbox.contentstream.PDFStreamEngine.processStream(PDFStreamEngine.java:460)
>         at org.apache.pdfbox.contentstream.PDFStreamEngine.processPage(PDFStreamEngine.java:150)
>         at org.apache.pdfbox.rendering.PageDrawer.drawPage(PageDrawer.java:189)
>         at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:145)
>         at org.apache.pdfbox.rendering.PDFRenderer.renderImage(PDFRenderer.java:68)
>
>
> Thanks in advance,
> Michael Ng
>


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