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https://issues.apache.org/jira/browse/PDFBOX-2726?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14376581#comment-14376581
]
Tilman Hausherr edited comment on PDFBOX-2726 at 3/23/15 8:58 PM:
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{code}
/Filter [/JBIG2Decode]
/Height 3755
/Length 57773
/Subtype /Image
/ColorSpace /DeviceGray
/DecodeParms [<<
/Width 1244 0 R
/Height 1245 0 R
/JB2Quality 1246 0 R
/DoHalftoneCoding false
>>]
{code}
I initially thought it is a malformed PDF but it isn't. Because the filter is
in a 1-element array, the decodeparms dictionaries are also to be in an array.
There's a method to get the correct item but it wasn't used in the JBIG2Filter
for some reason. This wasn't discovered earlier because usually PDF creators
don't use an array if there is only one filter.
was (Author: tilman):
{code}
/Filter [/JBIG2Decode]
/Height 3755
/Length 57773
/Subtype /Image
/ColorSpace /DeviceGray
/DecodeParms [<<
/Width 1244 0 R
/Height 1245 0 R
/JB2Quality 1246 0 R
/DoHalftoneCoding false
>>]
{code}
I initially thought it is a malformed PDF but it isn't. Because the filter is
in an array, the decodeparms dictionaries are also to be in an array. There's a
method to get the correct item but it wasn't used in the JBIG2Filter for some
reason.
> org.apache.pdfbox.cos.COSArray cannot be cast to
> org.apache.pdfbox.cos.COSDictionary
> ------------------------------------------------------------------------------------
>
> Key: PDFBOX-2726
> URL: https://issues.apache.org/jira/browse/PDFBOX-2726
> Project: PDFBox
> Issue Type: Bug
> Affects Versions: 1.8.8, 1.8.9, 2.0.0
> Environment: levigo-jbig2-imageio-1.6.1.jar, jai_codec.jar,
> jai_imageio.jar
> Reporter: Dmitry Andreev
> Assignee: Tilman Hausherr
> Labels: JBIG2
> Attachments: Book_1.Working_project.pdf,
> Book_1.Working_project_1.jpg, PDFBOX-2726.pdf
>
>
> When I start .convertToImage() this error is occur:
> org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap getRGBImage
> SEVERE: java.lang.ClassCastException: org.apache.pdfbox.cos.COSArray cannot
> be cast to org.apache.pdfbox.cos.COSDictionary
> java.lang.ClassCastException: org.apache.pdfbox.cos.COSArray cannot be cast
> to org.apache.pdfbox.cos.COSDictionary
> at org.apache.pdfbox.filter.JBIG2Filter.decode(JBIG2Filter.java:73)
> at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:351)
> at org.apache.pdfbox.cos.COSStream.doDecode(COSStream.java:299)
> at
> org.apache.pdfbox.cos.COSStream.getUnfilteredStream(COSStream.java:225)
> at
> org.apache.pdfbox.pdmodel.common.PDStream.createInputStream(PDStream.java:232)
> at
> org.apache.pdfbox.pdmodel.common.PDStream.getByteArray(PDStream.java:510)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.getRGBImage(PDPixelMap.java:254)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage.mask(PDXObjectImage.java:221)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDXObjectImage.applyMasks(PDXObjectImage.java:154)
> at
> org.apache.pdfbox.pdmodel.graphics.xobject.PDPixelMap.getRGBImage(PDPixelMap.java:365)
> at
> org.apache.pdfbox.util.operator.pagedrawer.Invoke.process(Invoke.java:87)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processOperator(PDFStreamEngine.java:557)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:268)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processSubStream(PDFStreamEngine.java:235)
> at
> org.apache.pdfbox.util.PDFStreamEngine.processStream(PDFStreamEngine.java:215)
> at org.apache.pdfbox.pdfviewer.PageDrawer.drawPage(PageDrawer.java:139)
> at org.apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.java:801)
> at org.apache.pdfbox.pdmodel.PDPage.convertToImage(PDPage.java:732)
> at com.sign.PDFCutter.PDFCut(PDFCutter.java:75)
> at com.sign.CopyFileTree.visitFile(CopyFileTree.java:103)
> at com.sign.CopyFileTree.visitFile(CopyFileTree.java:21)
> at java.nio.file.Files.walkFileTree(Files.java:2667)
> at java.nio.file.Files.walkFileTree(Files.java:2739)
> at com.sign.Copy.main(Copy.java:158)
> and some resulting images are blank, some images in grey shades with fading
> text
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