Hee Jeong Kim created PDFBOX-4598:
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Summary: oversized jbig2 decoded result that causing unnecessary
operation
Key: PDFBOX-4598
URL: https://issues.apache.org/jira/browse/PDFBOX-4598
Project: PDFBox
Issue Type: Bug
Components: JBIG2
Affects Versions: 3.0.2 JBIG2
Reporter: Hee Jeong Kim
Attachments: sample.pdf, use_packed_raster_to_read_Jbig2_image.patch
Hi! I am using pdfbox 2.0.16 and jbig2-imageio 3.0.2 to read JBIG2 images, and
found some issue to report.
It seems like jbig2-imageio creates oversized BufferedImage, and this also
makes pdfbox to do unnecessary operations.
To read Jbig2 image, pdfbox with jbig2-imageio do followings:
1. find JBIG2 ImageReader
(https://github.com/apache/pdfbox/blob/2.0.16/pdfbox/src/main/java/org/apache/pdfbox/filter/JBIG2Filter.java#L67)
2. read Image and get BufferedImage as a result
(https://github.com/apache/pdfbox/blob/2.0.16/pdfbox/src/main/java/org/apache/pdfbox/filter/JBIG2Filter.java#L106)
2-1. JBIG2 ImageIO 3.0.2 get decoded bitmap
(https://github.com/apache/pdfbox-jbig2/blob/3.0.2/src/main/java/org/apache/pdfbox/jbig2/JBIG2ImageReader.java#L249)
2-2. return the given bitmap as buffered image
(https://github.com/apache/pdfbox-jbig2/blob/3.0.2/src/main/java/org/apache/pdfbox/jbig2/JBIG2ImageReader.java#L259)
The problem is
At step 2-1, roughly 59MB Bitmap is created for given Jbig2 image on the second
page of sample.pdf (which is correct),
but oversize(473MB, roughly) BufferedImage is returned at the step 2-2.
I think this is because jbig2-imageio uses a raster based on a
PixelInterleavedSampleModel and IndexColorModel with 8 bits.
https://github.com/apache/pdfbox-jbig2/blob/3.0.2/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java#L177
https://github.com/apache/pdfbox-jbig2/blob/3.0.2/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java#L286
https://github.com/apache/pdfbox-jbig2/blob/3.0.2/src/main/java/org/apache/pdfbox/jbig2/image/Bitmaps.java#L291
This also makes pdfbox to check a pixel size of the color model of result
buffered image,
https://github.com/apache/pdfbox/blob/2.0.16/pdfbox/src/main/java/org/apache/pdfbox/filter/JBIG2Filter.java#L116
and to create another BufferedImage with binary type since it is not 1. (jbig2
is 1-bit depth)
https://github.com/apache/pdfbox/blob/2.0.16/pdfbox/src/main/java/org/apache/pdfbox/filter/JBIG2Filter.java#L122
I think we should call createPackedRaster and use the returned raster which is
based on MultiPixelPackedSampleModel, and use IndexColorModel with 1 bits since
jbig2 is for bi-level image. Please check the attached patch. I tested with the
patch, and it seems like this patch works well.
You can reproduce this issue with the second of the sample.pdf file that I
attached.
You can also download the file from here:
http://www.newsgn.com/data/newsgn_com/pdf/201802/2018022229524590.pdf
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